{"id":6180,"date":"2025-10-09T17:43:48","date_gmt":"2025-10-09T08:43:48","guid":{"rendered":"https:\/\/sky-peace.net\/?p=6180"},"modified":"2025-10-09T17:43:48","modified_gmt":"2025-10-09T08:43:48","slug":"db-keyword","status":"publish","type":"post","link":"https:\/\/sky-peace.net\/certified\/db-keyword\/","title":{"rendered":"\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u4f7f\u7528\u3055\u308c\u308b\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u8a18\u8ff0\u30eb\u30fc\u30eb\u307e\u3068\u3081"},"content":{"rendered":"

p>\u672c\u8a18\u4e8b\u306f\u3001\u5b9f\u52d9\u3068\u8a66\u9a13\u53cc\u65b9\u3067\u6df7\u4e71\u3057\u3084\u3059\u3044SQL\u306e\u201c\u7d30\u304b\u3044\u66f8\u304d\u65b9\u201d\u3092\u3001\u5171\u901a\u539f\u5247 \u2192 \u53e5\u30fb\u69cb\u6587\u3054\u3068\u306e\u30eb\u30fc\u30eb \u2192 \u899a\u3048\u65b9 \u2192 \u3059\u3050\u4f7f\u3048\u308b\u4f8b<\/strong>\u306e\u9806\u3067\u6574\u7406\u3057\u305f\u7dcf\u307e\u3068\u3081\u3067\u3059\u3002WordPress\u30b3\u30fc\u30c9\u30a8\u30c7\u30a3\u30bf\u306b\u305d\u306e\u307e\u307e\u8cbc\u308a\u4ed8\u3051\u3066\u4f7f\u3048\u307e\u3059\u3002<\/p>\n

🧱 1. \u30c7\u30fc\u30bf\u5b9a\u7fa9\uff08DDL\uff1aCREATE \/ ALTER \/ DROP\uff09<\/h2>\n
\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u533a\u5206<\/th>\n\u69cb\u6587<\/th>\n\u66f8\u304d\u65b9\u30fb\u899a\u3048\u65b9<\/th>\n\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
\u30c6\u30fc\u30d6\u30eb\u4f5c\u6210<\/strong><\/td>\nCREATE TABLE<\/code><\/td>\n\u578b\u306b\u306f()<\/code>\u3001\u6587\u5b57\u5217\u306f''<\/code>\u3001\u95a2\u6570\u306f\u7d20<\/td>\nCREATE TABLE users (id INT, name VARCHAR(50));<\/code><\/td>\n<\/tr>\n
\u4e3b\u30ad\u30fc<\/strong><\/td>\nPRIMARY KEY<\/code><\/td>\n\u8907\u6570\u5217\u53ef\uff08PRIMARY KEY (a,b)<\/code>\uff09<\/td>\nPRIMARY KEY (id)<\/code><\/td>\n<\/tr>\n
\u5916\u90e8\u30ad\u30fc<\/strong><\/td>\nFOREIGN KEY ... REFERENCES<\/code><\/td>\n\u5b50\u2192\u89aa\u3092\u53c2\u7167<\/td>\nFOREIGN KEY (dept_id) REFERENCES dept(id)<\/code><\/td>\n<\/tr>\n
\u5236\u7d04\u540d<\/strong><\/td>\nCONSTRAINT \u540d<\/code><\/td>\n\u660e\u793a\u547d\u540d\uff08\u7ba1\u7406\u306b\u4fbf\u5229\uff09<\/td>\nCONSTRAINT fk_user FOREIGN KEY ...<\/code><\/td>\n<\/tr>\n
ON DELETE \/ UPDATE<\/strong><\/td>\nCASCADE \/ SET NULL \/ RESTRICT \/ NO ACTION \/ SET DEFAULT<\/code><\/td>\n\u30c9\u30df\u30ce\uff0f\u5b64\u5150\uff0f\u7981\u6b62\uff0f\u540c\u7fa9\uff0f\u521d\u671f\u5316<\/td>\n\u2014<\/td>\n<\/tr>\n
\u30c7\u30d5\u30a9\u30eb\u30c8\u5024<\/strong><\/td>\nDEFAULT \u5024<\/code><\/td>\n\u6587\u5b57\u306f''<\/code>\u3001\u95a2\u6570\u306f\u7d20\u66f8\u304d<\/td>\nDEFAULT 'A'<\/code>, DEFAULT CURRENT_TIMESTAMP<\/code><\/td>\n<\/tr>\n
NOT NULL<\/strong><\/td>\n\u7a7a\u5024\u7981\u6b62<\/td>\nNULL<\/code>\u306f\u8a31\u53ef<\/td>\n\u2014<\/td>\n<\/tr>\n
UNIQUE<\/strong><\/td>\n\u91cd\u8907\u7981\u6b62<\/td>\n\u8907\u5408\u30ad\u30fc\u53ef<\/td>\n\u2014<\/td>\n<\/tr>\n
CHECK<\/strong><\/td>\n\u5024\u306e\u7bc4\u56f2\u5236\u7d04<\/td>\n\u6761\u4ef6\u5f0f\u3067\u6307\u5b9a<\/td>\nCHECK (age >= 0)<\/code><\/td>\n<\/tr>\n
AUTO INCREMENT\u7cfb<\/strong><\/td>\nDB\u4f9d\u5b58 (SERIAL<\/code>, IDENTITY<\/code>, AUTO_INCREMENT<\/code>)<\/td>\n\u6574\u6570\u4e3b\u30ad\u30fc\u5411\u3051<\/td>\n\u2014<\/td>\n<\/tr>\n
ALTER TABLE<\/strong><\/td>\n\u5217\u8ffd\u52a0\u30fb\u524a\u9664\u30fb\u5236\u7d04\u5909\u66f4<\/td>\nALTER TABLE ... ADD COLUMN ...<\/code><\/td>\n\u2014<\/td>\n<\/tr>\n
DROP TABLE<\/strong><\/td>\n\u30c6\u30fc\u30d6\u30eb\u524a\u9664<\/td>\nIF EXISTS<\/code>\u3067\u5b89\u5168\u5316<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n

📦 2. \u30c7\u30fc\u30bf\u64cd\u4f5c\uff08DML\uff1aSELECT \/ INSERT \/ UPDATE \/ DELETE\uff09<\/h2>\n
\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u64cd\u4f5c<\/th>\n\u69cb\u6587<\/th>\n\u899a\u3048\u65b9\u30fb\u6ce8\u610f\u70b9<\/th>\n\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
SELECT<\/strong><\/td>\nSELECT \u5217 FROM \u8868 WHERE \u6761\u4ef6<\/code><\/td>\n\u30af\u30a9\u30fc\u30c8\u306f\u6587\u5b57\u3060\u3051 '...'<\/code><\/td>\n\u2014<\/td>\n<\/tr>\n
WHERE\u53e5<\/strong><\/td>\n\u6bd4\u8f03\u30fb\u8ad6\u7406\u5f0f<\/td>\nAND \/ OR \/ NOT<\/code><\/td>\nWHERE age >= 20 AND gender='M'<\/code><\/td>\n<\/tr>\n
LIKE<\/strong><\/td>\n\u3042\u3044\u307e\u3044\u691c\u7d22<\/td>\n%<\/code>\uff1d\u4efb\u610f\u6587\u5b57\u5217\u3001_<\/code>\uff1d1\u6587\u5b57<\/td>\nLIKE 'A%'<\/code><\/td>\n<\/tr>\n
BETWEEN<\/strong><\/td>\n\u7bc4\u56f2\u6307\u5b9a\uff08\u542b\u3080\uff09<\/td>\nA BETWEEN 10 AND 20<\/code><\/td>\n\u2014<\/td>\n<\/tr>\n
IN<\/strong><\/td>\n\u8907\u6570\u4e00\u81f4<\/td>\nIN ('A','B')<\/code><\/td>\n\u2014<\/td>\n<\/tr>\n
IS NULL \/ IS NOT NULL<\/strong><\/td>\nNULL\u6bd4\u8f03\u5c02\u7528<\/td>\n=<\/code>\u3067\u306f\u5224\u5b9a\u4e0d\u53ef<\/td>\n\u2014<\/td>\n<\/tr>\n
ORDER BY<\/strong><\/td>\n\u4e26\u3073\u66ff\u3048<\/td>\nASC\/ DESC\u7701\u7565\u53ef<\/td>\nORDER BY age DESC<\/code><\/td>\n<\/tr>\n
GROUP BY<\/strong><\/td>\n\u96c6\u7d04\u5358\u4f4d<\/td>\nSELECT\u5185\u306b\u975e\u96c6\u7d04\u5217\u306fNG<\/td>\n\u2014<\/td>\n<\/tr>\n
HAVING<\/strong><\/td>\n\u96c6\u7d04\u5f8c\u306e\u6761\u4ef6<\/td>\nWHERE\u306e\u5f8c\u306e\u30d5\u30a3\u30eb\u30bf<\/td>\n\u2014<\/td>\n<\/tr>\n
LIMIT \/ OFFSET<\/strong><\/td>\n\u4ef6\u6570\u30fb\u30da\u30fc\u30b8\u30f3\u30b0<\/td>\nMySQL\/PG\u5bfe\u5fdc<\/td>\nLIMIT 10 OFFSET 20<\/code><\/td>\n<\/tr>\n
INSERT<\/strong><\/td>\nINSERT INTO \u8868(\u5217...) VALUES(...)<\/code><\/td>\n\u5217\u9806\u3068\u5024\u9806\u3092\u4e00\u81f4<\/td>\n\u2014<\/td>\n<\/tr>\n
UPDATE<\/strong><\/td>\nUPDATE \u8868 SET \u5217=\u5024 WHERE \u6761\u4ef6<\/code><\/td>\nWHERE\u7701\u7565\uff1d\u5168\u66f4\u65b0\u6ce8\u610f<\/td>\n\u2014<\/td>\n<\/tr>\n
DELETE<\/strong><\/td>\nDELETE FROM \u8868 WHERE \u6761\u4ef6<\/code><\/td>\nWHERE\u7701\u7565\uff1d\u5168\u524a\u9664\u6ce8\u610f<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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⚙️ 3. \u30c7\u30fc\u30bf\u5236\u5fa1\uff08DCL\uff1aGRANT \/ REVOKE \/ TRANSACTION\uff09<\/h2>\n
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\n\n\n\n\n\n\n\n\n\n\n\n\n
\u533a\u5206<\/th>\n\u69cb\u6587<\/th>\n\u610f\u5473\u30fb\u899a\u3048\u65b9<\/th>\n\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
\u6a29\u9650\u4ed8\u4e0e<\/strong><\/td>\nGRANT \u6a29\u9650 ON \u5bfe\u8c61 TO \u30e6\u30fc\u30b6<\/code><\/td>\n\u201c\u8d08\u308b\u201d\u2192GRANT<\/td>\nGRANT SELECT ON users TO user1;<\/code><\/td>\n<\/tr>\n
\u6a29\u9650\u53d6\u308a\u6d88\u3057<\/strong><\/td>\nREVOKE \u6a29\u9650 ON \u5bfe\u8c61 FROM \u30e6\u30fc\u30b6<\/code><\/td>\n\u201c\u53d6\u308a\u4e0a\u3052\u308b\u201d\u2192REVOKE<\/td>\n\u2014<\/td>\n<\/tr>\n
\u518d\u914d\u5e03\u8a31\u53ef<\/strong><\/td>\nWITH GRANT OPTION<\/code><\/td>\n\u6a29\u9650\u3092\u4ed6\u4eba\u306b\u3082\u4e0e\u3048\u3089\u308c\u308b<\/td>\n\u2014<\/td>\n<\/tr>\n
\u30ed\u30fc\u30eb\u4ed8\u4e0e<\/strong><\/td>\nGRANT \u5f79\u5272 TO \u30e6\u30fc\u30b6<\/code><\/td>\n\u7ba1\u7406\u5358\u4f4d<\/td>\n\u2014<\/td>\n<\/tr>\n
\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u958b\u59cb<\/strong><\/td>\nBEGIN \/ START TRANSACTION<\/code><\/td>\n\u4e00\u9023\u306e\u51e6\u7406\u3092\u307e\u3068\u3081\u308b<\/td>\n\u2014<\/td>\n<\/tr>\n
\u78ba\u5b9a<\/strong><\/td>\nCOMMIT<\/code><\/td>\n\u6c38\u7d9a\u5316<\/td>\n\u2014<\/td>\n<\/tr>\n
\u53d6\u308a\u6d88\u3057<\/strong><\/td>\nROLLBACK<\/code><\/td>\n\u76f4\u524d\u72b6\u614b\u306b\u623b\u3059<\/td>\n\u2014<\/td>\n<\/tr>\n
SAVEPOINT<\/strong><\/td>\n\u90e8\u5206\u623b\u3057\u7528\u30dd\u30a4\u30f3\u30c8<\/td>\nROLLBACK TO SAVEPOINT<\/code><\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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🧮 4. \u96c6\u7d04\u95a2\u6570\u30fb\u30a6\u30a3\u30f3\u30c9\u30a6\u95a2\u6570\uff08OVER\u53e5\uff09<\/h2>\n
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\n\n\n\n\n\n\n\n\n
\u5206\u985e<\/th>\n\u95a2\u6570<\/th>\n\u610f\u5473<\/th>\n\u6ce8\u610f<\/th>\n<\/tr>\n<\/thead>\n
\u96c6\u7d04\u95a2\u6570<\/td>\nSUM()<\/code>, AVG()<\/code>, MAX()<\/code>, MIN()<\/code>, COUNT()<\/code><\/td>\n\u96c6\u56e3\u8a08\u7b97<\/td>\nNULL\u306f\u9664\u5916<\/td>\n<\/tr>\n
\u30a6\u30a3\u30f3\u30c9\u30a6\u95a2\u6570<\/td>\nRANK()<\/code>, ROW_NUMBER()<\/code>, LAG()<\/code>, LEAD()<\/code>, SUM() OVER()<\/code><\/td>\n\u884c\u5358\u4f4d\u96c6\u8a08<\/td>\nOVER()<\/code>\u3067\u7bc4\u56f2\u6307\u5b9a<\/td>\n<\/tr>\n
OVER\u53e5<\/td>\nOVER (PARTITION BY ... ORDER BY ...)<\/code><\/td>\n\u533a\u5207\u308a\uff0b\u9806\u5e8f<\/td>\nORDER BY\u304c\u7bc4\u56f2\u5b9a\u7fa9<\/td>\n<\/tr>\n
WINDOW\u53e5<\/td>\nWINDOW win AS (...)<\/code><\/td>\n\u518d\u5229\u7528\u53ef\u80fd\u306a\u30a6\u30a3\u30f3\u30c9\u30a6\u5b9a\u7fa9<\/td>\nSELECT\u53e5\u306e\u5f8c\u3067\u5b9a\u7fa9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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🔸 \u899a\u3048\u65b9<\/strong>\uff1a\u300cOVER\u306f\u7a93\u300d\u300cPARTITION\u3067\u30b0\u30eb\u30fc\u30d7\u300d\u300cORDER\u3067\u4e26\u3079\u66ff\u3048\u300d<\/p>\n<\/blockquote>\n

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🔗 5. \u7d50\u5408\u30fb\u526f\u554f\u5408\u305b<\/h2>\n
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\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u533a\u5206<\/th>\n\u69cb\u6587<\/th>\n\u610f\u5473<\/th>\n\u30dd\u30a4\u30f3\u30c8<\/th>\n<\/tr>\n<\/thead>\n
INNER JOIN<\/strong><\/td>\n\u4e21\u65b9\u306b\u5b58\u5728\u3059\u308b\u30c7\u30fc\u30bf\u306e\u307f<\/td>\n\u6700\u3082\u4e00\u822c\u7684<\/td>\nON<\/code>\u3067\u7d50\u5408\u6761\u4ef6<\/td>\n<\/tr>\n
LEFT JOIN<\/strong><\/td>\n\u5de6\u3092\u5168\u6b8b\u3057<\/td>\nNULL\u57cb\u3081<\/td>\n\u2014<\/td>\n<\/tr>\n
RIGHT JOIN<\/strong><\/td>\n\u53f3\u3092\u5168\u6b8b\u3057<\/td>\n\u2014<\/td>\n<\/td>\n<\/tr>\n
FULL JOIN<\/strong><\/td>\n\u4e21\u65b9\u5168\u6b8b\u3057<\/td>\nDB\u4f9d\u5b58\uff08MySQL\u975e\u5bfe\u5fdc\uff09<\/td>\n\u2014<\/td>\n<\/tr>\n
CROSS JOIN<\/strong><\/td>\n\u5168\u7d44\u307f\u5408\u308f\u305b<\/td>\n\u6761\u4ef6\u306a\u3057\u7d50\u5408<\/td>\n\u2014<\/td>\n<\/tr>\n
UNION \/ UNION ALL<\/strong><\/td>\n\u7d50\u679c\u30bb\u30c3\u30c8\u7d50\u5408<\/td>\nALL\u306f\u91cd\u8907\u8a31\u53ef<\/td>\n\u2014<\/td>\n<\/tr>\n
EXISTS<\/strong><\/td>\n\u30b5\u30d6\u30af\u30a8\u30ea\u5b58\u5728\u78ba\u8a8d<\/td>\nEXISTS (SELECT ...)<\/code><\/td>\n\u2014<\/td>\n<\/tr>\n
ANY \/ ALL<\/strong><\/td>\n\u6bd4\u8f03\u30b5\u30d6\u30af\u30a8\u30ea<\/td>\n=ANY(...)<\/code>, >ALL(...)<\/code><\/td>\n\u2014<\/td>\n<\/tr>\n
FROM (SELECT…) AS \u5225\u540d<\/strong><\/td>\n\u6d3e\u751f\u8868<\/td>\n\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u4eee\u30c6\u30fc\u30d6\u30eb\u306b<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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🧩 6. \u305d\u306e\u4ed6\u306e\u69cb\u6587\u30fb\u95a2\u6570\u30fb\u4fee\u98fe\u53e5<\/h2>\n
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\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u30ad\u30fc\u30ef\u30fc\u30c9<\/th>\n\u610f\u5473<\/th>\n\u6ce8\u610f\u30fb\u899a\u3048\u65b9<\/th>\n<\/tr>\n<\/thead>\n
DISTINCT<\/strong><\/td>\n\u91cd\u8907\u9664\u53bb<\/td>\n\u96c6\u7d04\u6642\u306e\u5e73\u5747\u3067\u6ce8\u610f<\/td>\n<\/tr>\n
CASE WHEN THEN ELSE END<\/strong><\/td>\n\u6761\u4ef6\u5206\u5c90<\/td>\nIF\u306e\u4ee3\u308f\u308a<\/td>\n<\/tr>\n
CAST \/ CONVERT<\/strong><\/td>\n\u578b\u5909\u63db<\/td>\n'2025-01-01'::DATE<\/code> (PG)<\/td>\n<\/tr>\n
COALESCE \/ NVL<\/strong><\/td>\nNULL\u7f6e\u63db<\/td>\nCOALESCE(a,b)<\/td>\n<\/tr>\n
ISNULL()<\/strong><\/td>\nNULL\u5224\u5b9a\u95a2\u6570\uff08DB\u4f9d\u5b58\uff09<\/td>\n\u2014<\/td>\n<\/tr>\n
EXPLAIN \/ EXPLAIN ANALYZE<\/strong><\/td>\n\u5b9f\u884c\u8a08\u753b\u78ba\u8a8d<\/td>\n\u6027\u80fd\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u7528<\/td>\n<\/tr>\n
TRUNCATE TABLE<\/strong><\/td>\n\u5168\u524a\u9664\uff08\u30ed\u30b0\u6b8b\u3089\u305a\u9ad8\u901f\uff09<\/td>\nWHERE\u4e0d\u53ef<\/td>\n<\/tr>\n
COMMENT ON<\/strong><\/td>\n\u30b3\u30e1\u30f3\u30c8\u4ed8\u52a0\uff08PG\uff09<\/td>\nCOMMENT ON COLUMN users.name IS '\u30e6\u30fc\u30b6\u540d';<\/code><\/td>\n<\/tr>\n
INDEX<\/strong><\/td>\n\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f5c\u6210<\/td>\nCREATE INDEX idx_name ON table(column)<\/code><\/td>\n<\/tr>\n
VIEW<\/strong><\/td>\n\u4eee\u60f3\u30c6\u30fc\u30d6\u30eb<\/td>\nCREATE VIEW v AS SELECT ...<\/code><\/td>\n<\/tr>\n
MATERIALIZED VIEW<\/strong><\/td>\n\u5b9f\u4f53\u3092\u6301\u3064\u30d3\u30e5\u30fc<\/td>\n\u66f4\u65b0\u5fc5\u8981<\/td>\n<\/tr>\n
SEQUENCE<\/strong><\/td>\n\u81ea\u52d5\u63a1\u756a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/td>\nPG\u5c02\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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🧠 7. \u66f8\u304d\u65b9\u30eb\u30fc\u30eb\u30fb\u62ec\u5f27\uff0f\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u6cd5\u5247<\/h2>\n
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\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7a2e\u985e<\/th>\n\u8a18\u53f7<\/th>\n\u7528\u9014<\/th>\n\u4f8b<\/th>\n<\/tr>\n<\/thead>\n
( )<\/strong><\/td>\n\u62ec\u5f27<\/td>\n\u95a2\u6570\u30fb\u578b\u30b5\u30a4\u30ba\u30fb\u30b5\u30d6\u30af\u30a8\u30ea\u30fb\u6761\u4ef6<\/td>\nCOUNT(*)<\/code>, VARCHAR(50)<\/code>, (SELECT...)<\/code><\/td>\n<\/tr>\n
‘ ‘<\/strong><\/td>\n\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c8<\/td>\n\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb<\/td>\n'abc'<\/code><\/td>\n<\/tr>\n
” “<\/strong><\/td>\n\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c8<\/td>\n\u8b58\u5225\u5b50\uff08\u5217\u30fb\u8868\u540d\uff09\u203bSQL\u6a19\u6e96<\/td>\n\"user\"<\/code><\/td>\n<\/tr>\n
<\/code><\/strong><\/td>\n\u30d0\u30c3\u30af\u30af\u30a9\u30fc\u30c8<\/td>\nMySQL\u56fa\u6709\u8b58\u5225\u5b50<\/td>\n`user`<\/code><\/td>\n<\/tr>\n
;<\/strong><\/td>\n\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u7d42\u7aef<\/td>\n\u30b3\u30de\u30f3\u30c9\u533a\u5207\u308a<\/td>\n\u2014<\/td>\n<\/tr>\n
.<\/strong><\/td>\n\u30b9\u30ad\u30fc\u30de\u30fb\u8868\u30fb\u5217\u306e\u968e\u5c64\u6307\u5b9a<\/td>\nschema.table.column<\/code><\/td>\n<\/td>\n<\/tr>\n
::<\/strong><\/td>\n\u660e\u793a\u578b\u5909\u63db\uff08PostgreSQL\uff09<\/td>\n'100'::INTEGER<\/code><\/td>\n<\/td>\n<\/tr>\n
–, \/<\/strong>\/ **<\/td>\n\u30b3\u30e1\u30f3\u30c8<\/td>\n-- \u884c\u30b3\u30e1\u30f3\u30c8<\/code>, \/* \u30d6\u30ed\u30c3\u30af *\/<\/code><\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n

🔥 8. \u4e38\u6697\u8a18\u7cfb\u30d5\u30ec\u30fc\u30ba\u3067\u6574\u7406\uff08\u76f4\u611f\u30a4\u30e1\u30fc\u30b8\uff09<\/h2>\n
\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u610f\u5473<\/th>\n\u30d5\u30ec\u30fc\u30ba<\/th>\n<\/tr>\n<\/thead>\n
\u578b\u5b9a\u7fa9<\/td>\n\u300c\u578b\u306b()\u3001\u5024\u306b”\u3001\u95a2\u6570\u306f\u7d20\u3067\u300d<\/td>\n<\/tr>\n
\u5236\u7d04\u524a\u9664<\/td>\n\u300cCASCADE\u3067\u5dfb\u304d\u6dfb\u3048\u3001RESTRICT\u3067\u6b62\u3081\u308b\u300d<\/td>\n<\/tr>\n
\u6a29\u9650<\/td>\n\u300cGRANT\u3067\u8d08\u308b\u3001REVOKE\u3067\u596a\u3046\u300d<\/td>\n<\/tr>\n
\u6bd4\u8f03<\/td>\n\u300cLIKE\u3067\u3086\u308b\u304f\u3001%\u3067\u7121\u9650\u3001_\u30671\u6587\u5b57\u300d<\/td>\n<\/tr>\n
NULL\u51e6\u7406<\/td>\n\u300cIS NULL\u306f=\u3058\u3083\u306a\u3044\u3001COALESCE\u3067\u4ee3\u5165\u300d<\/td>\n<\/tr>\n
\u96c6\u7d04<\/td>\n\u300cGROUP\u3067\u307e\u3068\u3081\u3001HAVING\u3067\u7d5e\u308b\u300d<\/td>\n<\/tr>\n
\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3<\/td>\n\u300cBEGIN\u3057\u3066COMMIT\u3001\u5931\u6557\u306fROLLBACK\u300d<\/td>\n<\/tr>\n
JOIN<\/td>\n\u300cINNER\u304c\u901a\u5e38\u3001LEFT\u3067\u5168\u6b8b\u3057\u300d<\/td>\n<\/tr>\n
\u30c7\u30d5\u30a9\u30eb\u30c8<\/td>\n\u300c\u9759\u7684\u5024\u306f”\u3001\u52d5\u7684\u306f\u7d20\u300d<\/td>\n<\/tr>\n
ORDER\u53e5<\/td>\n\u300c\u6607\u9806ASC\u3001\u964d\u9806DESC\u3001\u8907\u6570\u53ef\u300d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n

🗂️ 9. \u899a\u3048\u308b\u512a\u5148\u5ea6\uff08\u8a66\u9a13\u30fb\u5b9f\u52d9\u5225\uff09<\/h2>\n
\n
\n\n\n\n\n\n\n\n
\u30ec\u30d9\u30eb<\/th>\n\u512a\u5148\u30ad\u30fc\u30ef\u30fc\u30c9<\/th>\n<\/tr>\n<\/thead>\n
⭐\u521d\u7d1a<\/td>\nSELECT \/ WHERE \/ ORDER \/ INSERT \/ UPDATE \/ DELETE \/ LIKE \/ IN \/ IS NULL<\/td>\n<\/tr>\n
⭐⭐\u4e2d\u7d1a<\/td>\nJOIN \/ GROUP \/ HAVING \/ CASE \/ DEFAULT \/ FOREIGN KEY \/ ON DELETE<\/td>\n<\/tr>\n
⭐⭐⭐\u4e0a\u7d1a<\/td>\nWINDOW\u53e5 \/ TRANSACTION\u5236\u5fa1 \/ GRANT \/ REVOKE \/ VIEW \/ INDEX \/ CASCADE \/ SUBQUERY<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n

✅ 10. \u307e\u3068\u3081\uff1aSQL\u8a18\u8ff0\u30eb\u30fc\u30eb\u306e\u9ec4\u91d1\u5f8b\uff08\u8a9e\u611f\u3067\u6697\u8a18\uff09<\/h1>\n

\u578b\u306b()\u3001\u5024\u306b”\u3001\u95a2\u6570\u306f\u7d20\u3002<\/strong>
\u6b62\u3081\u308b(RESTRICT)\u3001\u6d41\u3059(CASCADE)\u3002<\/strong>
\u8d08\u308b(GRANT)\u3001\u596a\u3046(REVOKE)\u3002<\/strong>
LIKE\u306f\u66d6\u6627\u3001%\u306f\u81ea\u7531\u3001_\u306f1\u6587\u5b57\u3002<\/strong>
IS NULL\u306f\u7279\u5225\u3001=\u3067\u306f\u306a\u3044\u3002<\/strong>
OVER\u306f\u7a93\u3001PARTITION\u306f\u90e8\u5c4b\u3002<\/strong>
ROLLBACK\u306f\u6642\u9593\u3092\u623b\u3059\u9b54\u6cd5\u3002<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

p>\u672c\u8a18\u4e8b\u306f\u3001\u5b9f\u52d9\u3068\u8a66\u9a13\u53cc\u65b9\u3067\u6df7\u4e71\u3057\u3084\u3059\u3044SQL\u306e\u201c\u7d30\u304b\u3044\u66f8\u304d\u65b9\u201d\u3092\u3001\u5171\u901a\u539f\u5247 \u2192 \u53e5\u30fb\u69cb\u6587\u3054\u3068\u306e\u30eb\u30fc\u30eb \u2192 \u899a\u3048\u65b9 \u2192 \u3059\u3050\u4f7f\u3048\u308b\u4f8b\u306e\u9806\u3067\u6574\u7406\u3057\u305f\u7dcf\u307e\u3068\u3081\u3067\u3059\u3002WordPress\u30b3\u30fc\u30c9\u30a8\u30c7\u30a3\u30bf … <\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","columnck":"","stmeta_robots":"noindex, follow","st_titlewords":"","st_title_extra":"","st_keywords":"","st_description":"","st_display_ad_mark":"","st_display_ad_mark_hide":"","textcopyck":"","st_copyright":"","st_copyurl":"","eyecatch_set":"","st_youtube_url":"","st_youtube_eyecatch":"","headerwidget_set":"","updatewidget_set":"","kanrenwidget_set":"","ikkatuwidget_set":"","koukoku_set":"","auto_adsense_koukoku_set":"","st_redirect":"","st_redirect_url_as_canonical":"","st_redirect_pvm_do_not_track":"","post_data_updatewidget_set":"","st_post_header_under_bg":"","st_twitter_tag":"","affinger_note":"","rankdisplayck":"","st_head_code":"","st_footer_code":"","st_post_header_under_code":"","_st_toc_override":false,"_st_toc_settings":[]},"categories":[3],"tags":[6],"class_list":["post-6180","post","type-post","status-publish","format-standard","hentry","category-ipa","tag-6"],"_links":{"self":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/posts\/6180","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/comments?post=6180"}],"version-history":[{"count":0,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/posts\/6180\/revisions"}],"wp:attachment":[{"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/media?parent=6180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/categories?post=6180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sky-peace.net\/certified\/wp-json\/wp\/v2\/tags?post=6180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}