{"id":184,"date":"2024-06-15T12:05:38","date_gmt":"2024-06-15T04:05:38","guid":{"rendered":"http:\/\/zhaoyanqi.cn\/?p=184"},"modified":"2024-06-19T22:13:50","modified_gmt":"2024-06-19T14:13:50","slug":"mysql%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e4%bb%8b%e7%bb%8d%e5%92%8c%e5%b8%b8%e8%a7%81%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e5%af%b9%e6%af%94","status":"publish","type":"post","link":"https:\/\/zhaoyanqi.cn\/?p=184","title":{"rendered":"Mysql\u6570\u636e\u7c7b\u578b\u4ecb\u7ecd\u548c\u5e38\u89c1\u6570\u636e\u7c7b\u578b\u5bf9\u6bd4"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"vmyvz\">MySQL \u6570\u636e\u7c7b\u578b\u4ecb\u7ecd (\u7ed3\u5408\u5b9e\u9645\u516c\u53f8\u9879\u76ee\u4e2d\u7684\u6848\u4f8b\u8bf4\u660e\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u7684\u4f7f\u7528\u573a\u666f)\u3002<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"f91c2f84\">1. \u6570\u503c\u7c7b\u578b<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"62889da4\">\u6574\u6570\u7c7b\u578b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TINYINT<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u8f83\u5c0f\u7684\u6574\u6570\uff0c\u5982\u7528\u6237\u8bc4\u5206\uff080-10\uff09\uff0c\u5e03\u5c14\u503c\uff080 \u6216 1\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"dabe98e1\" class=\"wp-block-code\"><code>CREATE TABLE user_ratings (\n    user_id INT,\n    rating TINYINT\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SMALLINT<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u8f83\u5c0f\u8303\u56f4\u7684\u6574\u6570\uff0c\u5982\u4ea7\u54c1\u5e93\u5b58\u6570\u91cf\uff080-32767\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"0ce8af65\" class=\"wp-block-code\"><code>CREATE TABLE product_inventory (\n    product_id INT,\n    quantity SMALLINT\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MEDIUMINT<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u4e2d\u7b49\u8303\u56f4\u7684\u6574\u6570\uff0c\u5982\u7528\u6237\u6570\u91cf\u8f83\u591a\u7684\u5e94\u7528\uff080-16777215\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"0563983d\" class=\"wp-block-code\"><code>CREATE TABLE user_stats (\n    user_id MEDIUMINT UNSIGNED,\n    posts_count MEDIUMINT\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>INT\uff08INTEGER\uff09<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u5e38\u89c4\u6574\u6570\uff0c\u5982\u7528\u6237ID\u3001\u8ba2\u5355ID\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"78406040\" class=\"wp-block-code\"><code>CREATE TABLE orders (\n    order_id INT AUTO_INCREMENT PRIMARY KEY,\n    user_id INT,\n    total_amount DECIMAL(10, 2)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BIGINT<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u5927\u8303\u56f4\u7684\u6574\u6570\uff0c\u5982\u793e\u4ea4\u5e73\u53f0\u4e0a\u7684\u7528\u6237\u70b9\u8d5e\u6570\uff080-18446744073709551615\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"71ab8a68\" class=\"wp-block-code\"><code>CREATE TABLE post_likes (\n    post_id BIGINT,\n    like_count BIGINT\n);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3bf0132b\">\u6d6e\u70b9\u6570\u7c7b\u578b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>FLOAT(M, D)<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff0c\u5982\u79d1\u5b66\u8ba1\u7b97\u3001\u56fe\u5f62\u5904\u7406\u4e2d\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"9cf0d4f8\" class=\"wp-block-code\"><code>CREATE TABLE sensor_data (\n    sensor_id INT,\n    temperature FLOAT(5, 2)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DOUBLE(M, D)<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\uff0c\u5982\u91d1\u878d\u8ba1\u7b97\u4e2d\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"5dd3d58f\" class=\"wp-block-code\"><code>CREATE TABLE financial_data (\n    record_id INT,\n    amount DOUBLE(15, 8)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DECIMAL(M, D)<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u7cbe\u786e\u6570\u503c\uff0c\u5982\u5546\u54c1\u4ef7\u683c\u3001\u8d27\u5e01\u91d1\u989d\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"43237f23\" class=\"wp-block-code\"><code>CREATE TABLE products (\n    product_id INT AUTO_INCREMENT PRIMARY KEY,\n    price DECIMAL(10, 2)\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5393e379\">2. \u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DATE<\/strong>\uff1a\u5b58\u50a8\u65e5\u671f\uff0c\u5982\u751f\u65e5\u3001\u6ce8\u518c\u65e5\u671f\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"a4aae765\" class=\"wp-block-code\"><code>CREATE TABLE users (\n    user_id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50),\n    birthdate DATE\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TIME<\/strong>\uff1a\u5b58\u50a8\u65f6\u95f4\uff0c\u5982\u5de5\u4f5c\u6253\u5361\u65f6\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"e7f9e3a7\" class=\"wp-block-code\"><code>CREATE TABLE work_hours (\n    employee_id INT,\n    check_in TIME,\n    check_out TIME\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DATETIME<\/strong>\uff1a\u5b58\u50a8\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u5982\u8ba2\u5355\u521b\u5efa\u65f6\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"1243a676\" class=\"wp-block-code\"><code>CREATE TABLE orders (\n    order_id INT AUTO_INCREMENT PRIMARY KEY,\n    order_datetime DATETIME\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TIMESTAMP<\/strong>\uff1a\u5b58\u50a8\u65f6\u95f4\u6233\uff0c\u5982\u8bb0\u5f55\u6570\u636e\u7684\u521b\u5efa\u548c\u66f4\u65b0\u65f6\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"0c49ff7a\" class=\"wp-block-code\"><code>CREATE TABLE logs (\n    log_id INT AUTO_INCREMENT PRIMARY KEY,\n    log_message TEXT,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,\n    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>YEAR<\/strong>\uff1a\u5b58\u50a8\u5e74\u4efd\uff0c\u5982\u51fa\u7248\u5e74\u4efd\u3001\u5e74\u5ea6\u62a5\u544a\u5e74\u4efd\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"7b590d70\" class=\"wp-block-code\"><code>CREATE TABLE publications (\n    publication_id INT AUTO_INCREMENT PRIMARY KEY,\n    title VARCHAR(255),\n    publication_year YEAR\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"b47db054\">3. \u5b57\u7b26\u4e32\u7c7b\u578b<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"cc4dd1da\">\u5b57\u7b26\u4e32<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CHAR(M)<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u56fa\u5b9a\u957f\u5ea6\u5b57\u7b26\u4e32\uff0c\u5982\u56fd\u5bb6\u4ee3\u7801\u3001\u90ae\u653f\u7f16\u7801\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"a4459df6\" class=\"wp-block-code\"><code>CREATE TABLE countries (\n    country_code CHAR(3),\n    country_name VARCHAR(255)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>VARCHAR(M)<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u53ef\u53d8\u957f\u5ea6\u5b57\u7b26\u4e32\uff0c\u5982\u7528\u6237\u540d\u3001\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"09706b69\" class=\"wp-block-code\"><code>CREATE TABLE customers (\n    customer_id INT AUTO_INCREMENT PRIMARY KEY,\n    email VARCHAR(255) UNIQUE\n);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"97d07614\">\u6587\u672c<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TINYTEXT<\/strong>\uff1a\u5b58\u50a8\u77ed\u6587\u672c\uff0c\u5982\u6ce8\u91ca\u3001\u6807\u7b7e\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"f76f4283\" class=\"wp-block-code\"><code>CREATE TABLE comments (\n    comment_id INT AUTO_INCREMENT PRIMARY KEY,\n    comment_text TINYTEXT\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TEXT<\/strong>\uff1a\u5b58\u50a8\u8f83\u957f\u6587\u672c\uff0c\u5982\u535a\u5ba2\u6587\u7ae0\u5185\u5bb9\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"1d6b5543\" class=\"wp-block-code\"><code>CREATE TABLE blog_posts (\n    post_id INT AUTO_INCREMENT PRIMARY KEY,\n    post_content TEXT\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MEDIUMTEXT<\/strong>\uff1a\u5b58\u50a8\u66f4\u957f\u7684\u6587\u672c\uff0c\u5982\u4ea7\u54c1\u63cf\u8ff0\u3001\u5927\u578b\u6587\u6863\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"51cffdda\" class=\"wp-block-code\"><code>CREATE TABLE product_descriptions (\n    product_id INT AUTO_INCREMENT PRIMARY KEY,\n    description MEDIUMTEXT\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>LONGTEXT<\/strong>\uff1a\u5b58\u50a8\u6781\u957f\u6587\u672c\uff0c\u5982\u4e66\u7c4d\u3001\u767e\u79d1\u5168\u4e66\u5185\u5bb9\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"bd07589a\" class=\"wp-block-code\"><code>CREATE TABLE books (\n    book_id INT AUTO_INCREMENT PRIMARY KEY,\n    content LONGTEXT\n);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"6168fb08\">\u4e8c\u8fdb\u5236<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BINARY(M)<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u56fa\u5b9a\u957f\u5ea6\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"50c63c9c\" class=\"wp-block-code\"><code>CREATE TABLE binaries (\n    binary_id INT AUTO_INCREMENT PRIMARY KEY,\n    data BINARY(16)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>VARBINARY(M)<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u53ef\u53d8\u957f\u5ea6\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"30b80114\" class=\"wp-block-code\"><code>CREATE TABLE files (\n    file_id INT AUTO_INCREMENT PRIMARY KEY,\n    file_data VARBINARY(255)\n);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1262fbaa\">\u5927\u5bf9\u8c61<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TINYBLOB<\/strong>\uff1a\u5b58\u50a8\u5c0f\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5982\u7f29\u7565\u56fe\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"83731b3e\" class=\"wp-block-code\"><code>CREATE TABLE thumbnails (\n    thumbnail_id INT AUTO_INCREMENT PRIMARY KEY,\n    image TINYBLOB\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BLOB<\/strong>\uff1a\u5b58\u50a8\u4e2d\u7b49\u5927\u5c0f\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5982\u6587\u6863\u3001\u56fe\u7247\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"b019392a\" class=\"wp-block-code\"><code>CREATE TABLE documents (\n    document_id INT AUTO_INCREMENT PRIMARY KEY,\n    content BLOB\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MEDIUMBLOB<\/strong>\uff1a\u5b58\u50a8\u8f83\u5927\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5982\u97f3\u9891\u6587\u4ef6\u3001\u89c6\u9891\u6587\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"85c4d191\" class=\"wp-block-code\"><code>CREATE TABLE media_files (\n    media_id INT AUTO_INCREMENT PRIMARY KEY,\n    file MEDIUMBLOB\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>LONGBLOB<\/strong>\uff1a\u5b58\u50a8\u975e\u5e38\u5927\u7684\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5982\u8d85\u5927\u89c6\u9891\u3001\u6570\u636e\u5e93\u5907\u4efd\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"7098f256\" class=\"wp-block-code\"><code>CREATE TABLE large_media (\n    media_id INT AUTO_INCREMENT PRIMARY KEY,\n    data LONGBLOB\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"84930be7\">4. \u679a\u4e3e\u548c\u96c6\u5408\u7c7b\u578b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ENUM<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u679a\u4e3e\u7c7b\u578b\u7684\u503c\uff0c\u5982\u6027\u522b\u3001\u72b6\u6001\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"2def7eee\" class=\"wp-block-code\"><code>CREATE TABLE employees (\n    employee_id INT AUTO_INCREMENT PRIMARY KEY,\n    name VARCHAR(100),\n    gender ENUM('Male', 'Female', 'Other')\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SET<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u4e00\u7ec4\u503c\uff0c\u5982\u5174\u8da3\u7231\u597d\u3001\u6280\u80fd\u6807\u7b7e\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"106c3d75\" class=\"wp-block-code\"><code>CREATE TABLE user_profiles (\n    profile_id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50),\n    hobbies SET('Reading', 'Traveling', 'Cooking', 'Sports')\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1f505e69\">5. \u7279\u6b8a\u7c7b\u578b<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BIT<\/strong>\uff1a\u7528\u4e8e\u5b58\u50a8\u4f4d\u5b57\u6bb5\uff0c\u53ef\u4ee5\u5b58\u50a8 0 \u548c 1 \u7684\u4f4d\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"1dbc6d11\" class=\"wp-block-code\"><code>CREATE TABLE bit_example (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    bit_field BIT(1)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BOOLEAN<\/strong>\uff1aMySQL \u4e2d BOOLEAN \u662f TINYINT(1) \u7684\u540c\u4e49\u8bcd\uff0c\u7528\u4e8e\u5b58\u50a8\u5e03\u5c14\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<pre id=\"1881debc\" class=\"wp-block-code\"><code>CREATE TABLE boolean_example (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    is_active BOOLEAN\n);<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"QMsgL\">\u5e38\u89c1\u6570\u636e\u7c7b\u578b\u5bf9\u6bd4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"b427008e\">1. CHAR vs. VARCHAR<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"CHAR\">CHAR<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u56fa\u5b9a\u957f\u5ea6\u5b57\u7b26\u7c7b\u578b\u3002<\/li>\n\n\n\n<li>\u957f\u5ea6\u4e0d\u8db3\u4f1a\u4f7f\u7528\u7a7a\u683c\u586b\u5145\u3002<\/li>\n\n\n\n<li>\u6700\u5927\u957f\u5ea6\u4e3a 255 \u4e2a\u5b57\u7b26\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u901f\u5ea6\u5feb\uff0c\u56e0\u4e3a\u5b58\u50a8\u548c\u68c0\u7d22\u65f6\u957f\u5ea6\u56fa\u5b9a\u3002<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u957f\u5ea6\u56fa\u5b9a\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u5b58\u50a8\u7a7a\u95f4\u5229\u7528\u7387\u4f4e\uff0c\u5bf9\u4e8e\u957f\u5ea6\u53d8\u5316\u8f83\u5927\u7684\u6570\u636e\u4f1a\u6d6a\u8d39\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"VARCHAR\">VARCHAR<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ef\u53d8\u957f\u5ea6\u5b57\u7b26\u7c7b\u578b\u3002<\/li>\n\n\n\n<li>\u53ea\u5b58\u50a8\u5b9e\u9645\u5b57\u7b26\u7684\u957f\u5ea6\uff0c\u5916\u52a0 1 \u4e2a\u5b57\u8282\u8bb0\u5f55\u957f\u5ea6\uff08\u5982\u679c\u957f\u5ea6\u5c0f\u4e8e 255\uff09\uff0c\u6216 2 \u4e2a\u5b57\u8282\uff08\u5982\u679c\u957f\u5ea6\u8d85\u8fc7 255\uff09\u3002<\/li>\n\n\n\n<li>\u6700\u5927\u957f\u5ea6\u4e3a 65535 \u4e2a\u5b57\u7b26\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u5b58\u50a8\u7a7a\u95f4\u5229\u7528\u7387\u9ad8\uff0c\u9002\u7528\u4e8e\u957f\u5ea6\u4e0d\u56fa\u5b9a\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u5b58\u50a8\u548c\u68c0\u7d22\u7a0d\u6162\uff0c\u56e0\u4e3a\u957f\u5ea6\u53ef\u53d8\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"0a3168ec\">\u5b9e\u9645\u5e94\u7528<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CHAR<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"b64d7129\" class=\"wp-block-code\"><code>CREATE TABLE country_codes (\n    country_code CHAR(3),\n    country_name VARCHAR(50)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>VARCHAR<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"08be96bb\" class=\"wp-block-code\"><code>CREATE TABLE users (\n    user_id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50),\n    email VARCHAR(255)\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"c96336ed\">2. TEXT vs. BLOB<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"TEXT\">TEXT<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7528\u4e8e\u5b58\u50a8\u5927\u6587\u672c\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u5206\u4e3a TINYTEXT\u3001TEXT\u3001MEDIUMTEXT\u3001LONGTEXT\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u5b58\u50a8\u5927\u6587\u672c\u6570\u636e\uff0c\u5982\u6587\u7ae0\u5185\u5bb9\u3001\u8bc4\u8bba\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u65e0\u6cd5\u5b58\u50a8\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"BLOB\">BLOB<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7528\u4e8e\u5b58\u50a8\u5927\u4e8c\u8fdb\u5236\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u5206\u4e3a TINYBLOB\u3001BLOB\u3001MEDIUMBLOB\u3001LONGBLOB\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u5b58\u50a8\u4e8c\u8fdb\u5236\u6570\u636e\uff0c\u5982\u56fe\u7247\u3001\u97f3\u9891\u3001\u89c6\u9891\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u65e0\u6cd5\u5b58\u50a8\u6587\u672c\u6570\u636e\uff0c\u9700\u8981\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u683c\u5f0f\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"0a3168ec-1\">\u5b9e\u9645\u5e94\u7528<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TEXT<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"p0Rdv\" class=\"wp-block-code\"><code>CREATE TABLE blog_posts (\n    post_id INT AUTO_INCREMENT PRIMARY KEY,\n    post_content TEXT\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BLOB<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"8c9e669f\" class=\"wp-block-code\"><code>CREATE TABLE images (\n    image_id INT AUTO_INCREMENT PRIMARY KEY,\n    image_data BLOB\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7a2f11ee\">3. FLOAT vs. DOUBLE vs. DECIMAL<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"FLOAT\">FLOAT<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\u3002<\/li>\n\n\n\n<li>\u901a\u5e38\u7528\u4e8e\u79d1\u5b66\u8ba1\u7b97\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5360\u7528\u7a7a\u95f4\u5c0f\uff084 \u5b57\u8282\uff09\u3002<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u7cbe\u5ea6\u8981\u6c42\u4e0d\u9ad8\u7684\u573a\u666f\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u7cbe\u5ea6\u4f4e\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u820d\u5165\u8bef\u5dee\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"DOUBLE\">DOUBLE<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570\u3002<\/li>\n\n\n\n<li>\u901a\u5e38\u7528\u4e8e\u91d1\u878d\u8ba1\u7b97\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7cbe\u5ea6\u9ad8\u4e8e FLOAT\u3002<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u9700\u8981\u8f83\u9ad8\u7cbe\u5ea6\u7684\u8ba1\u7b97\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u5360\u7528\u7a7a\u95f4\u8f83\u5927\uff088 \u5b57\u8282\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"DECIMAL\">DECIMAL<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9a\u70b9\u6570\u3002<\/li>\n\n\n\n<li>\u901a\u5e38\u7528\u4e8e\u5b58\u50a8\u7cbe\u786e\u6570\u503c\uff0c\u5982\u8d27\u5e01\u91d1\u989d\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7cbe\u5ea6\u9ad8\uff0c\u6ca1\u6709\u820d\u5165\u8bef\u5dee\u3002<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u9700\u8981\u7cbe\u786e\u6570\u503c\u7684\u573a\u666f\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u5360\u7528\u7a7a\u95f4\u6839\u636e\u5b9a\u4e49\u7684\u7cbe\u5ea6\u548c\u5c0f\u6570\u4f4d\u6570\u53d8\u5316\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"0a3168ec-2\">\u5b9e\u9645\u5e94\u7528<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>FLOAT<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"etePp\" class=\"wp-block-code\"><code>CREATE TABLE sensor_data (\n    sensor_id INT,\n    temperature FLOAT(5, 2)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DOUBLE<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"04696c3f\" class=\"wp-block-code\"><code>CREATE TABLE scientific_calculations (\n    calculation_id INT AUTO_INCREMENT PRIMARY KEY,\n    value DOUBLE(15, 8)\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DECIMAL<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"49e4335f\" class=\"wp-block-code\"><code>CREATE TABLE financial_records (\n    record_id INT AUTO_INCREMENT PRIMARY KEY,\n    amount DECIMAL(10, 2)\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"8676032a\">4. ENUM vs. SET<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"ENUM\">ENUM<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u679a\u4e3e\u7c7b\u578b\uff0c\u5b9a\u4e49\u4e00\u7ec4\u9884\u8bbe\u7684\u5b57\u7b26\u4e32\u503c\u3002<\/li>\n\n\n\n<li>\u53ea\u80fd\u5b58\u50a8\u5176\u4e2d\u4e00\u4e2a\u503c\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b58\u50a8\u7a7a\u95f4\u5c0f\uff0c\u6548\u7387\u9ad8\u3002<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u5b57\u6bb5\u503c\u8f83\u5c11\u4e14\u56fa\u5b9a\u7684\u60c5\u51b5\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u4fee\u6539\u9884\u8bbe\u503c\u9700\u8981\u4fee\u6539\u8868\u7ed3\u6784\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"SET\">SET<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u96c6\u5408\u7c7b\u578b\uff0c\u5b9a\u4e49\u4e00\u7ec4\u9884\u8bbe\u7684\u5b57\u7b26\u4e32\u503c\u3002<\/li>\n\n\n\n<li>\u53ef\u4ee5\u5b58\u50a8\u5176\u4e2d\u4e00\u4e2a\u6216\u591a\u4e2a\u503c\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u591a\u9009\u5b57\u6bb5\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u5b58\u50a8\u548c\u64cd\u4f5c\u76f8\u5bf9\u590d\u6742\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"0a3168ec-3\">\u5b9e\u9645\u5e94\u7528<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ENUM<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"D1GV9\" class=\"wp-block-code\"><code>CREATE TABLE employees (\n    employee_id INT AUTO_INCREMENT PRIMARY KEY,\n    name VARCHAR(100),\n    gender ENUM('Male', 'Female', 'Other')\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SET<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"afQ53\" class=\"wp-block-code\"><code>CREATE TABLE user_profiles (\n    profile_id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50),\n    hobbies SET('Reading', 'Traveling', 'Cooking', 'Sports')\n);<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"c2878bab\">5. DATE vs. DATETIME vs. TIMESTAMP<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"DATE\">DATE<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b58\u50a8\u65e5\u671f\uff0c\u683c\u5f0f\u4e3a &#8216;YYYY-MM-DD&#8217;\u3002<\/li>\n\n\n\n<li>\u5360\u7528 3 \u5b57\u8282\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u53ea\u9700\u8981\u65e5\u671f\u7684\u573a\u666f\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u4e0d\u5b58\u50a8\u65f6\u95f4\u90e8\u5206\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"DATETIME\">DATETIME<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b58\u50a8\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u683c\u5f0f\u4e3a &#8216;YYYY-MM-DD HH:MM:SS&#8217;\u3002<\/li>\n\n\n\n<li>\u5360\u7528 8 \u5b57\u8282\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u9002\u7528\u4e8e\u9700\u8981\u5b8c\u6574\u65e5\u671f\u548c\u65f6\u95f4\u7684\u573a\u666f\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u65e0\u65f6\u533a\u4fe1\u606f\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"TIMESTAMP\">TIMESTAMP<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b58\u50a8\u65f6\u95f4\u6233\uff0c\u683c\u5f0f\u4e3a &#8216;YYYY-MM-DD HH:MM:SS&#8217;\u3002<\/li>\n\n\n\n<li>\u5360\u7528 4 \u5b57\u8282\u3002<\/li>\n\n\n\n<li>\u81ea\u52a8\u521d\u59cb\u5316\u548c\u66f4\u65b0\u5f53\u524d\u65f6\u95f4\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9002\u7528\u4e8e\u8bb0\u5f55\u4fee\u6539\u65f6\u95f4\u548c\u521b\u5efa\u65f6\u95f4\u3002<\/li>\n\n\n\n<li>\u652f\u6301\u65f6\u533a\u8f6c\u6362\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u8303\u56f4\u6709\u9650\uff081970-2038 \u5e74\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"0a3168ec-4\">\u5b9e\u9645\u5e94\u7528<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DATE<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"24281291\" class=\"wp-block-code\"><code>CREATE TABLE users (\n    user_id INT AUTO_INCREMENT PRIMARY KEY,\n    birthdate DATE\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DATETIME<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"1d5d7af3\" class=\"wp-block-code\"><code>CREATE TABLE appointments (\n    appointment_id INT AUTO_INCREMENT PRIMARY KEY,\n    appointment_time DATETIME\n);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TIMESTAMP<\/strong>\uff1a<\/li>\n<\/ul>\n\n\n\n<pre id=\"ce81932f\" class=\"wp-block-code\"><code>CREATE TABLE logs (\n    log_id INT AUTO_INCREMENT PRIMARY KEY,\n    log_message TEXT,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>MySQL \u6570\u636e\u7c7b\u578b\u4ecb\u7ecd (\u7ed3\u5408\u5b9e\u9645\u516c\u53f8\u9879\u76ee\u4e2d\u7684\u6848\u4f8b\u8bf4\u660e\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u7684\u4f7f\u7528\u573a\u666f)\u3002 1. \u6570\u503c\u7c7b\u578b \u6574\u6570\u7c7b\u578b  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,8],"tags":[],"class_list":["post-184","post","type-post","status-publish","format-standard","hentry","category-mysql_basic_management","category-mysql"],"_links":{"self":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/184","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=184"}],"version-history":[{"count":1,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/184\/revisions"}],"predecessor-version":[{"id":185,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=\/wp\/v2\/posts\/184\/revisions\/185"}],"wp:attachment":[{"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=184"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=184"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zhaoyanqi.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=184"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}