{"id":3020,"date":"2026-05-09T21:50:59","date_gmt":"2026-05-09T13:50:59","guid":{"rendered":"https:\/\/tekno.bali-island.com\/?p=3020"},"modified":"2026-05-09T21:51:02","modified_gmt":"2026-05-09T13:51:02","slug":"ddl%e3%80%81%e3%83%87%e3%83%bc%e3%82%bf%e5%9e%8b%e3%80%81%e3%82%ad%e3%83%bc%e3%80%81%e5%88%b6%e7%b4%84-mysql","status":"publish","type":"post","link":"https:\/\/tekno.bali-island.com\/ja\/articles\/ddl%e3%80%81%e3%83%87%e3%83%bc%e3%82%bf%e5%9e%8b%e3%80%81%e3%82%ad%e3%83%bc%e3%80%81%e5%88%b6%e7%b4%84-mysql\/","title":{"rendered":"DDL\u3001\u30c7\u30fc\u30bf\u578b\u3001\u30ad\u30fc\u3001\u5236\u7d04 (MySQL)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>\u30c7\u30fc\u30bf\u5b9a\u7fa9\u8a00\u8a9e (DDL) \u306e\u7d39\u4ecb<\/strong><\/h2>\n\n\n\n<p><strong>DDL<\/strong>&nbsp;\u306f&nbsp;<em>Data Definition Language<\/em>&nbsp;\u306e\u7565\u3067\u3001SQL (<em>Structured Query Language<\/em>) \u306b\u304a\u3044\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5168\u4f53\u7684\u306a\u8a2d\u8a08\u3092\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306e\u30b3\u30de\u30f3\u30c9\u30bb\u30c3\u30c8\u3067\u3059\u3002DDL \u306e\u4e3b\u306a\u30b3\u30de\u30f3\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CREATE<\/strong>: \u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>ALTER<\/strong>: \u65e2\u5b58\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>DROP<\/strong>: \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u524a\u9664\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>MySQL \u306b\u304a\u3051\u308b CREATE\u3001ALTER\u3001DROP \u30b3\u30de\u30f3\u30c9\u306e\u4f7f\u7528<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>a. CREATE<\/strong><\/h3>\n\n\n\n<p>CREATE \u30b3\u30de\u30f3\u30c9\u306f\u3001\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u65b0\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u3001\u307e\u305f\u306f\u65b0\u3057\u3044&nbsp;<em>\u30d3\u30e5\u30fc<\/em>&nbsp;\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f8b:<\/strong>\u00a0CREATE DATABASE toko_buku;<\/li>\n\n\n\n<li><strong>\u8aac\u660e:<\/strong>\u00a0\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001toko_buku \u3068\u3044\u3046\u540d\u524d\u306e\u65b0\u3057\u3044\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>b. ALTER<\/strong><\/h3>\n\n\n\n<p>ALTER \u30b3\u30de\u30f3\u30c9\u306f\u3001\u65e2\u306b\u4f5c\u6210\u3055\u308c\u305f\u30c6\u30fc\u30d6\u30eb\u306e\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u306e\u64cd\u4f5c\u3067\u306f\u3001\u30ab\u30e9\u30e0\u306e\u8ffd\u52a0\u3001\u524a\u9664\u3001\u5909\u66f4\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u4fee\u6b63\u3001\u30ab\u30e9\u30e0\u3078\u306e\u65b0\u3057\u3044\u5c5e\u6027\u306e\u4ed8\u4e0e\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f8b:<\/strong>\u00a0ALTER TABLE buku ADD judul_buku varchar(20);<\/li>\n\n\n\n<li><strong>\u8aac\u660e:<\/strong>\u00a0\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001buku \u30c6\u30fc\u30d6\u30eb\u306b\u3001\u6700\u592720\u6587\u5b57\u306e varchar \u578b\u306e judul_buku \u3068\u3044\u3046\u65b0\u3057\u3044\u00a0<em>\u30d5\u30a3\u30fc\u30eb\u30c9<\/em>\u00a0(\u30ab\u30e9\u30e0) \u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>c. DROP<\/strong><\/h3>\n\n\n\n<p>DROP \u30b3\u30de\u30f3\u30c9\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304b\u3089\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5b8c\u5168\u306b\u524a\u9664\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u81ea\u4f53\u3001\u30c6\u30fc\u30d6\u30eb\u3001<em>\u95a2\u6570<\/em>\u3001<em>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/em>\u3001<em>\u30d7\u30ed\u30b7\u30fc\u30b8\u30e3<\/em>\u3001<em>\u30c8\u30ea\u30ac\u30fc<\/em>\u3001<em>\u30d3\u30e5\u30fc<\/em>&nbsp;\u306e\u3044\u305a\u308c\u304b\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f8b:<\/strong>\u00a0DROP DATABASE toko_buku;<\/li>\n\n\n\n<li><strong>\u8aac\u660e:<\/strong>\u00a0\u3053\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001toko_buku \u3068\u3044\u3046\u540d\u524d\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u524a\u9664\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>MySQL \u306e\u30c7\u30fc\u30bf\u578b<\/strong><\/h2>\n\n\n\n<p>\u9069\u5207\u306a\u30c7\u30fc\u30bf\u578b\u306e\u9078\u629e\u306f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u52b9\u7387\u306b\u3068\u3063\u3066\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306f\u3001MySQL \u306e\u30c7\u30fc\u30bf\u578b\u306e\u30ab\u30c6\u30b4\u30ea\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A. \u6570\u5024\u30c7\u30fc\u30bf\u578b<\/strong><\/h3>\n\n\n\n<p>\u6570\u5024\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TINYINT:<\/strong>\u00a0\u6574\u6570 (\u6b63\/\u8ca0) \u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: -128 \uff5e 127\u3002\u30b5\u30a4\u30ba: 1 \u30d0\u30a4\u30c8 (8 \u30d3\u30c3\u30c8)\u3002<\/li>\n\n\n\n<li><strong>SMALLINT:<\/strong>\u00a0\u6574\u6570\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: -32768 \uff5e 32767\u3002\u30b5\u30a4\u30ba: 2 \u30d0\u30a4\u30c8 (16 \u30d3\u30c3\u30c8)\u3002<\/li>\n\n\n\n<li><strong>MEDIUMINT:<\/strong>\u00a0\u6574\u6570\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: -8388608 \uff5e 8388607\u3002\u30b5\u30a4\u30ba: 3 \u30d0\u30a4\u30c8 (24 \u30d3\u30c3\u30c8)\u3002<\/li>\n\n\n\n<li><strong>INT:<\/strong>\u00a0\u6574\u6570\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: -2147483648 \uff5e 2147483647\u3002\u30b5\u30a4\u30ba: 4 \u30d0\u30a4\u30c8 (32 \u30d3\u30c3\u30c8)\u3002<\/li>\n\n\n\n<li><strong>BIGINT:<\/strong>\u00a0\u5927\u898f\u6a21\u306a\u6574\u6570\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: -9223372036854775808 \uff5e 9223372036854775807\u3002\u30b5\u30a4\u30ba: 8 \u30d0\u30a4\u30c8 (64 \u30d3\u30c3\u30c8)\u3002<\/li>\n\n\n\n<li><strong>FLOAT:<\/strong>\u00a0\u5358\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u30b5\u30a4\u30ba: 4 \u30d0\u30a4\u30c8 (32 \u30d3\u30c3\u30c8)\u3002<\/li>\n\n\n\n<li><strong>DOUBLE \/ REAL:<\/strong>\u00a0\u500d\u7cbe\u5ea6\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u30b5\u30a4\u30ba: 8 \u30d0\u30a4\u30c8 (64 \u30d3\u30c3\u30c8)\u3002<\/li>\n\n\n\n<li><strong>DECIMAL \/ NUMERIC:<\/strong>\u00a0\u975e\u5e38\u306b\u9ad8\u3044\u7cbe\u5ea6\u306e\u56fa\u5b9a\u5c0f\u6570\u70b9\u6570\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u30b5\u30a4\u30ba: 8 \u30d0\u30a4\u30c8 (64 \u30d3\u30c3\u30c8)\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>B. \u6587\u5b57\u5217\u30c7\u30fc\u30bf\u578b<\/strong><\/h3>\n\n\n\n<p>\u6587\u5b57\u307e\u305f\u306f\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CHAR:<\/strong>\u00a0\u56fa\u5b9a\u9577\u306e\u6587\u5b57\u5217\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059 (\u4f8b: \u5546\u54c1ID\u3001\u56fd\u6c11ID\u756a\u53f7)\u3002\u7bc4\u56f2: 0 \uff5e 255 \u6587\u5b57\u3002<\/li>\n\n\n\n<li><strong>VARCHAR:<\/strong>\u00a0\u53ef\u5909\u9577\u306e\u6587\u5b57\u5217\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: 0 \uff5e 65,535 \u6587\u5b57 (\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3)\u3002<\/li>\n\n\n\n<li><strong>TINYTEXT:<\/strong>\u00a0\u77ed\u3044\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: 0 \uff5e 255 \u6587\u5b57\u3002<\/li>\n\n\n\n<li><strong>TEXT:<\/strong>\u00a0\u6a19\u6e96\u7684\u306a\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: 0 \uff5e 65,535 \u6587\u5b57\u3002<\/li>\n\n\n\n<li><strong>MEDIUMTEXT:<\/strong>\u00a0\u4e2d\u7a0b\u5ea6\u306e\u9577\u3055\u306e\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: 0 \uff5e 16,777,215 \u6587\u5b57\u3002<\/li>\n\n\n\n<li><strong>LONGTEXT:<\/strong>\u00a0\u975e\u5e38\u306b\u9577\u3044\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: 0 \uff5e 4,294,967,295 \u6587\u5b57\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>C. \u65e5\u4ed8\u3068\u6642\u523b\u306e\u30c7\u30fc\u30bf\u578b<\/strong><\/h3>\n\n\n\n<p>\u65e5\u4ed8\u3068\u6642\u523b\u306e\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DATE:<\/strong>\u00a0\u65e5\u4ed8\u3092\u683c\u7d0d\u3057\u307e\u3059 (\u5f62\u5f0f: YYYY-MM-DD)\u3002\u7bc4\u56f2: &#8216;1000-01-01&#8217; \uff5e &#8216;9999-12-31&#8217;\u3002\u30b5\u30a4\u30ba: 3 \u30d0\u30a4\u30c8\u3002<\/li>\n\n\n\n<li><strong>TIME:<\/strong>\u00a0\u6642\u523b\u3092\u683c\u7d0d\u3057\u307e\u3059 (\u5f62\u5f0f: HH:MM:SS)\u3002\u7bc4\u56f2: &#8216;-838:59:59&#8217; \uff5e &#8216;+838:59:59&#8217;\u3002\u30b5\u30a4\u30ba: 3 \u30d0\u30a4\u30c8\u3002<\/li>\n\n\n\n<li><strong>DATETIME:<\/strong>\u00a0\u65e5\u4ed8\u3068\u6642\u523b\u306e\u7d44\u307f\u5408\u308f\u305b (\u5f62\u5f0f: YYYY-MM-DD HH:MM:SS)\u3002\u7bc4\u56f2: &#8216;1000-01-01 00:00:00&#8217; \uff5e &#8216;9999-12-31 23:59:59&#8217;\u3002\u30b5\u30a4\u30ba: 8 \u30d0\u30a4\u30c8\u3002<\/li>\n\n\n\n<li><strong>YEAR:<\/strong>\u00a0\u5e74\u3092\u683c\u7d0d\u3057\u307e\u3059 (\u5f62\u5f0f: YYYY)\u3002\u7bc4\u56f2: 1900 \uff5e 2155\u3002\u30b5\u30a4\u30ba: 1 \u30d0\u30a4\u30c8\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>D. BLOB \u30c7\u30fc\u30bf\u578b (\u30d0\u30a4\u30ca\u30ea)<\/strong><\/h3>\n\n\n\n<p>BLOB \u306f&nbsp;<em>Binary Large Object<\/em>&nbsp;\u306e\u7565\u3067\u3059\u3002\u7d14\u7c8b\u306a\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u3001<em>\u5927\u6587\u5b57\u3068\u5c0f\u6587\u5b57\u304c\u533a\u5225<\/em>&nbsp;\u3055\u308c\u3001\u753b\u50cf\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3001\u97f3\u58f0\u306a\u3069\u306e\u30de\u30eb\u30c1\u30e1\u30c7\u30a3\u30a2\u30d5\u30a1\u30a4\u30eb\u306b\u6700\u9069\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>BIT:<\/strong>\u00a0\u30d0\u30a4\u30ca\u30ea\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u307e\u3059\u3002\u7bc4\u56f2: 64 \u6841\u306e\u30d0\u30a4\u30ca\u30ea\u3002<\/li>\n\n\n\n<li><strong>TINYBLOB:<\/strong>\u00a0\u6700\u5927\u30b5\u30a4\u30ba 255 \u30d0\u30a4\u30c8\u3002<\/li>\n\n\n\n<li><strong>BLOB:<\/strong>\u00a0\u6700\u5927\u30b5\u30a4\u30ba 65,535 \u30d0\u30a4\u30c8\u3002<\/li>\n\n\n\n<li><strong>MEDIUMBLOB:<\/strong>\u00a0\u6700\u5927\u30b5\u30a4\u30ba 16,777,215 \u30d0\u30a4\u30c8\u3002<\/li>\n\n\n\n<li><strong>LONGBLOB:<\/strong>\u00a0\u6700\u5927\u30b5\u30a4\u30ba 4,294,967,295 \u30d0\u30a4\u30c8\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>SQL \u306e\u30ad\u30fc\u306e\u7a2e\u985e<\/strong><\/h2>\n\n\n\n<p>SQL \u306b\u304a\u3051\u308b\u30ad\u30fc\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u30c7\u30fc\u30bf\u884c\u3092\u4e00\u610f\u306b\u533a\u5225\u3057\u305f\u308a\u3001\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3092\u95a2\u9023\u4ed8\u3051\u305f\u308a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u30011 \u3064\u4ee5\u4e0a\u306e\u5c5e\u6027 (\u30ab\u30e9\u30e0) \u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30b9\u30fc\u30d1\u30fc\u30ad\u30fc:<\/strong>\u00a0\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5404\u30c7\u30fc\u30bf\u884c\u3092\u4e00\u610f\u306b\u8b58\u5225\u3067\u304d\u308b\u5c5e\u6027\u306e\u96c6\u5408\u3002<\/li>\n\n\n\n<li><strong>\u5019\u88dc\u30ad\u30fc:<\/strong>\u00a0\u5197\u9577\u306a\u5c5e\u6027\u3092\u6301\u305f\u306a\u3044\u6700\u5c0f\u306e\u30b9\u30fc\u30d1\u30fc\u30ad\u30fc\u3002\u5019\u88dc\u30ad\u30fc\u306f\u3001\u4e00\u610f\u306e\u5024\u3092\u8b58\u5225\u3067\u304d\u308b\u6700\u5c0f\u306e\u00a0<em>\u30d5\u30a3\u30fc\u30eb\u30c9<\/em>\u00a0\u306e\u7d44\u307f\u5408\u308f\u305b\u304b\u3089\u9078\u3070\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u4e3b\u30ad\u30fc:<\/strong>\u00a0<em>\u30ec\u30b3\u30fc\u30c9<\/em>\u00a0\u306e\u4e3b\u8981\u306a\u8b58\u5225\u5b50\u3068\u3057\u3066\u9078\u3070\u308c\u305f\u5019\u88dc\u30ad\u30fc\u3002\u4e3b\u30ad\u30fc\u306e\u30c7\u30fc\u30bf\u306f\u00a0<strong>\u7a7a\u306b\u3067\u304d\u305a<\/strong>\u00a0(<em>Not Null<\/em>)\u3001<strong>\u91cd\u8907\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093<\/strong>\u3002\u5404\u30c6\u30fc\u30d6\u30eb\u306b 1 \u3064\u3060\u3051\u4e3b\u30ad\u30fc\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u4ee3\u66ff\u30ad\u30fc:<\/strong>\u00a0\u4e3b\u30ad\u30fc\u3068\u3057\u3066\u00a0<em>\u9078\u3070\u308c\u306a\u304b\u3063\u305f<\/em>\u00a0\u5019\u88dc\u30ad\u30fc\u3002<\/li>\n\n\n\n<li><strong>\u5916\u90e8\u30ad\u30fc:<\/strong>\u00a0\u30c6\u30fc\u30d6\u30eb\u540c\u58eb\u3092\u95a2\u9023\u4ed8\u3051\u3001<em>\u89aa<\/em>\u00a0\u3068\u00a0<em>\u5b50<\/em>\u00a0\u306e\u95a2\u4fc2\u3092\u5f62\u6210\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u30ad\u30fc\u3002\u89aa\u30c6\u30fc\u30d6\u30eb\u306e\u4e3b\u30ad\u30fc\u306f\u3001\u95a2\u9023\u3059\u308b\u5b50\u30c6\u30fc\u30d6\u30eb\u306e\u5916\u90e8\u30ad\u30fc\u306b\u3088\u3063\u3066\u53c2\u7167\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>\u8907\u5408\u30ad\u30fc:<\/strong>\u00a0\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u305f\u3081\u306b\u30012 \u3064\u4ee5\u4e0a\u306e\u5c5e\u6027\u3067\u69cb\u6210\u3055\u308c\u308b\u30ad\u30fc\u3002\u901a\u5e38\u3001\u5358\u4e00\u306e\u30ab\u30e9\u30e0\u304c\u4e3b\u30ad\u30fc\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3055\u306a\u3044\u5834\u5408\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>MySQL \u306e\u5236\u7d04\u306e\u7a2e\u985e<\/strong><\/h2>\n\n\n\n<p><em>\u5236\u7d04<\/em>&nbsp;\u306f\u3001\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3068\u59a5\u5f53\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u3001\u30ab\u30e9\u30e0\u307e\u305f\u306f\u30c6\u30fc\u30d6\u30eb\u306b\u9069\u7528\u3055\u308c\u308b\u5236\u9650\u30eb\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>NOT NULL:<\/strong>\u00a0<em>\u30ec\u30b3\u30fc\u30c9<\/em>\u00a0\u306e\u633f\u5165\u6642\u306b\u30ab\u30e9\u30e0\u3092\u7a7a\u306e\u307e\u307e\u306b\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002\u305d\u306e\u30ab\u30e9\u30e0\u306b\u306f\u5fc5\u305a\u30c7\u30fc\u30bf\u3092\u5165\u529b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>UNIQUE:<\/strong>\u00a0\u30ab\u30e9\u30e0\u5185\u306e\u3059\u3079\u3066\u306e\u5024\u304c\u4e92\u3044\u306b\u7570\u306a\u308b\u3053\u3068 (\u30ec\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u304c\u306a\u3044\u3053\u3068) \u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>PRIMARY KEY:<\/strong>\u00a0NOT NULL \u5236\u7d04\u3068 UNIQUE \u5236\u7d04\u306e\u7d44\u307f\u5408\u308f\u305b\u3002\u30c6\u30fc\u30d6\u30eb\u5185\u306e\u5404\u884c\u3092\u4e00\u610f\u306b\u8b58\u5225\u3057\u307e\u3059\u30021 \u3064\u306e\u30c6\u30fc\u30d6\u30eb\u306b PRIMARY KEY \u306f 1 \u3064\u3060\u3051\u8a31\u53ef\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>FOREIGN KEY:<\/strong>\u00a0\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u53c2\u7167\u6574\u5408\u6027\u3092\u7dad\u6301\u3057\u307e\u3059\u3002<em>\u5b50<\/em>\u00a0\u30ab\u30e9\u30e0\u306e\u5024\u304c\u3001<em>\u89aa<\/em>\u00a0\u30ab\u30e9\u30e0 (\u5225\u306e\u30c6\u30fc\u30d6\u30eb) \u306b\u6709\u52b9\u306a\u53c2\u7167\u3092\u6301\u3064\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><strong>CHECK:<\/strong>\u00a0\u30c7\u30fc\u30bf\u304c\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u4fdd\u5b58\u3055\u308c\u308b\u524d\u306b\u691c\u8a3c\u307e\u305f\u306f\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3044\u307e\u3059\u3002\u30c7\u30fc\u30bf\u306f\u00a0<em>boolean<\/em>\u00a0\u5024\u3067\u8a55\u4fa1\u3055\u308c\u3001\u6761\u4ef6\u3092\u6e80\u305f\u305b\u3070\u00a0<em>true<\/em>\u00a0\u3068\u306a\u308a\u4fdd\u5b58\u3055\u308c\u307e\u3059\u304c\u3001<em>false<\/em>\u00a0\u306e\u5834\u5408\u306f SQL \u304c\u62d2\u5426\u3057\u3001<em>\u30a8\u30e9\u30fc<\/em>\u00a0\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30c7\u30fc\u30bf\u5b9a\u7fa9\u8a00\u8a9e (DDL) \u306e\u7d39\u4ecb DDL&nbsp;\u306f&nbsp;Data Definition Language&nbsp;\u306e\u7565\u3067\u3001SQL (Structured Query Language) \u306b\u304a\u3044\u3066\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5168\u4f53\u7684\u306a\u8a2d\u8a08\u3092\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306e\u30b3\u30de\u30f3\u30c9\u30bb\u30c3\u30c8\u3067\u3059\u3002DDL \u306e\u4e3b\u306a\u30b3\u30de\u30f3\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 MySQL \u306b\u304a\u3051\u308b CREATE\u3001ALTER\u3001DROP \u30b3\u30de\u30f3\u30c9\u306e\u4f7f\u7528 a. CREA &hellip;<\/p>\n","protected":false},"author":1,"featured_media":3002,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[100],"tags":[],"class_list":["post-3020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-100"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DDL\u3001\u30c7\u30fc\u30bf\u578b\u3001\u30ad\u30fc\u3001\u5236\u7d04 (MySQL)<\/title>\n<meta name=\"description\" content=\"\u521d\u5fc3\u8005\u5411\u3051\u306b DDL (CREATE\u3001ALTER\u3001DROP)\u3001\u30c7\u30fc\u30bf\u578b\u3001\u30ad\u30fc\u306e\u7a2e\u985e\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u5236\u7d04\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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content=\"Bali Island Tekno\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/people\/Wilanpedia\/61575048527927\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-05-09T13:50:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-09T13:51:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/tekno.bali-island.com\/wp-content\/uploads\/2026\/05\/DDL.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1080\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Wilan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"Wilan\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/tekno.bali-island.com\\\/ja\\\/articles\\\/ddl%e3%80%81%e3%83%87%e3%83%bc%e3%82%bf%e5%9e%8b%e3%80%81%e3%82%ad%e3%83%bc%e3%80%81%e5%88%b6%e7%b4%84-mysql\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/tekno.bali-island.com\\\/ja\\\/articles\\\/ddl%e3%80%81%e3%83%87%e3%83%bc%e3%82%bf%e5%9e%8b%e3%80%81%e3%82%ad%e3%83%bc%e3%80%81%e5%88%b6%e7%b4%84-mysql\\\/\"},\"author\":{\"name\":\"Wilan\",\"@id\":\"https:\\\/\\\/tekno.bali-island.com\\\/ja\\\/#\\\/schema\\\/person\\\/945426dbaeb9dc9d603797b51b1b7e42\"},\"headline\":\"DDL\u3001\u30c7\u30fc\u30bf\u578b\u3001\u30ad\u30fc\u3001\u5236\u7d04 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