{"id":345,"date":"2023-10-07T08:15:29","date_gmt":"2023-12-09T10:38:04","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/sql%e3%81%ae%e5%bc%8f\/"},"modified":"2025-07-31T22:50:50","modified_gmt":"2025-07-31T13:50:50","slug":"sql%e3%81%ae%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/sql%e3%81%ae%e5%bc%8f\/","title":{"rendered":"SQL\u306e\u5f0f"},"content":{"rendered":"

SQL\u5f0f\u306f\u30011\u3064\u4ee5\u4e0a\u306e\u5024\u3001\u6f14\u7b97\u5b50\u3001SQL\u95a2\u6570\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3042\u308a\u3001\u5024\u306b\u7d50\u679c\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306eSQL\u5f0f\u306f\u3001\u30d5\u30a9\u30fc\u30df\u30e5\u30e9\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3042\u308a\u3001\u30af\u30a8\u30ea\u8a00\u8a9e\u3067\u8a18\u8ff0\u3055\u308c\u307e\u3059\u3002\u307e\u305f\u3001\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u30af\u30a8\u30ea\u3059\u308b\u305f\u3081\u306b\u3082\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

SQL\u5f0f<\/h2>\n
\"SQL<\/div>\n
    \n
  1. \n
      \u30d6\u30fc\u30eb\u5024<\/ol>\n<\/li>\n<\/ol>\n

       <\/p>\n

        \n
      1. \n
          \u6570\u5024<\/ol>\n<\/li>\n<\/ol>\n

           <\/p>\n

            \u65e5\u4ed8<\/ol>\n

            \u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7528\u3044\u3066\u3001\u8868\u73fe\u306e\u3055\u307e\u3056\u307e\u306a\u30bf\u30a4\u30d7\u3092\u8a73\u7d30\u306b\u7406\u89e3\u3057\u3088\u3046\u3002<\/p>\n

            SQL\u306e\u30d6\u30fc\u30eb\u5f0f<\/h3>\n

            SQL \u30d6\u30fc\u30eb\u5f0f\u306f\u3001SQL \u30af\u30a8\u30ea\u306e\u4e00\u90e8\u3068\u3057\u3066\u6307\u5b9a\u3055\u308c\u305f\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u30af\u30a8\u30ea\u304c\u5b9f\u884c\u3055\u308c\u308b\u3068\u3001\u5358\u4e00\u306e\u5024\u306e\u307f\u3092\u53d6\u5f97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u305d\u306e\u69cb\u6587\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n

            SELECT column \r\nFROM table_name \r\nWHERE SINGLE_VALUE_MATCHING_EXPRESSION;\r\n<\/code><\/pre>\n
            \u30b5\u30f3\u30d7\u30eb\u30c7\u30fc\u30bf\u3092\u4f7f\u3063\u305f\u8868\u3092\u4f7f\u3063\u3066\u3001\u30d6\u30fc\u30eb\u5f0f\u3092\u7406\u89e3\u3057\u3088\u3046\u3068\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
            \n
            \n\n\n\n\n\n\n\n
            EmpId<\/th>\nEmpName<\/th>\nEmpAge<\/th>\nEmpSalary<\/th>\n<\/tr>\n<\/thead>\n
            1<\/td>\nJohn<\/td>\n32<\/td>\n2000<\/td>\n<\/tr>\n
            2<\/td>\nSmith<\/td>\n25<\/td>\n2500<\/td>\n<\/tr>\n
            3<\/td>\nHenry<\/td>\n29<\/td>\n3000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
            \u4e0a\u8a18\u3067\u8a00\u53ca\u3055\u308c\u305f\u5f93\u696d\u54e1\u30c6\u30fc\u30d6\u30eb\u3092\u4f8b\u3068\u3057\u3066\u8003\u616e\u3057\u307e\u3059\u3002\u4f8b\u306e\u30af\u30a8\u30ea\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
            SELECT EmpName FROM Employee WHERE EmpId = 1;\r\n<\/code><\/pre>\n
            \u4e0a\u8a18\u306e\u30af\u30a8\u30ea\u306f\u3001\u30af\u30a8\u30ea\u7d50\u679c\u3068\u3057\u3066 “John” \u3068\u3044\u3046\u5358\u4e00\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002SQL\u306e\u30d6\u30fc\u30eb\u5f0f\u306f\u3001\u5e38\u306b\u5358\u4e00\u306e\u7d50\u679c\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u4e3b\u30ad\u30fc\u3068\u4e00\u7dd2\u306b\u4f7f\u7528\u3059\u308b\u3079\u304d\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u30cd\u30b9\u30c8\u3055\u308c\u305fSQL\u306e\u9078\u629e\u30af\u30a8\u30ea\u306e\u5834\u5408\u306b\u5fc5\u8981\u3067\u3059\u3002<\/p>\n
            select posts.title, posts.author_id from posts, authors \r\nwhere posts.author_id = authors.id and \r\nposts.author_id = (select id from authors where name = 'Pankaj');\r\n<\/code><\/pre>\n
            \u4e0a\u8a18\u306e\u30af\u30a8\u30ea\u3067\u306f\u3001\u4f5c\u8005\u540d\u304cPankaj\u3067\u3042\u308b\u30dd\u30b9\u30c8\u306e\u540d\u524d\u3068ID\u304c\u3059\u3079\u3066\u8fd4\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u30cd\u30b9\u30c8\u3055\u308c\u305fSQL\u30af\u30a8\u30ea\u306f\u5e38\u306b1\u884c\u3060\u3051\u3092\u8fd4\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u3001Subquery returns more than 1 row\u3068\u3044\u3046\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
            SQL\u6570\u5024\u5f0f<\/h3>\n
            SQL\u30af\u30a8\u30ea\u3067\u6570\u5b66\u7684\u6f14\u7b97\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306bSQL\u6570\u5024\u5f0f\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
            SELECT NUMERICAL_EXPRESSION as OPERATION_NAME\r\nFROM table_name\r\n<\/code><\/pre>\n
            \u6570\u5024\u5f0f\u306f\u3001SQL\u30af\u30a8\u30ea\u3067\u4f7f\u7528\u3055\u308c\u308b\u95a2\u6570\u306e\u6570\u5b66\u7684\u306a\u5f0f\u3067\u3059\u3002\u4f8b\u3092\u4f7f\u3063\u3066\u6570\u5024\u5f0f\u3092\u7406\u89e3\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
            SELECT count(*) FROM Employee; -- 3\r\n<\/code><\/pre>\n
            \u4e0a\u8a18\u306e\u30af\u30a8\u30ea\u306f\u3001WHERE\u53e5\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u884c\u306e\u7dcf\u6570\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u3001COUNT(*)\u95a2\u6570\u306b\u3088\u3063\u30663\u3068\u7d50\u679c\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001select count(*) from employee where empsalary > 2400; \u306e\u5834\u5408\u30012\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002sum()\u3001avg()\u3001min()\u3001max()\u306a\u3069\u3001\u4ed6\u306e\u95a2\u6570\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u95a2\u6570\u306f\u6570\u5b66\u7684\u306a\u64cd\u4f5c\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002SQL\u6570\u5024\u5f0f\u306e\u3055\u3089\u306a\u308b\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
            SELECT sum(EmpSalary) as \"Salary\" FROM Employee; -- 7500\r\nselect min(EmpSalary) from Employee; -- 2000\r\nselect max(EmpSalary) from Employee; -- 3000\r\nselect sum(EmpSalary) from Employee; -- 7500\r\nselect avg(EmpSalary) from Employee; -- 2500.0000\r\n<\/code><\/pre>\n
            SQL\u306e\u65e5\u4ed8\u5f0f<\/h3>\n
            SQL\u306e\u65e5\u4ed8\u5f0f\u306f\u3001\u65e5\u6642\u306e\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002\u3044\u304f\u3064\u304b\u306eSQL\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3067\u65e5\u4ed8\u5f0f\u3092\u7406\u89e3\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
            SELECT CURRENT_TIMESTAMP; -- 2018-01-20 10:32:37\r\n\r\n-- For MYQSL\r\nSELECT now(); -- 2018-01-20 10:32:57\r\n\r\n-- For SQL Server\r\nSELECT GetDate();\r\n\r\n-- For Oracle DB\r\nselect sysdate from Dual; -- 20-JAN-18\r\n<\/code><\/pre>\n
            \u4e0a\u8a18\u306e\u30af\u30a8\u30ea\u306f\u30b7\u30b9\u30c6\u30e0\u306e\u73fe\u5728\u6642\u523b\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30d9\u30f3\u30c0\u30fc\u3054\u3068\u306b\u3001\u73fe\u5728\u306e\u65e5\u4ed8\u3084\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u306e\u5024\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u7279\u5b9a\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u9593\u3067\u3042\u308b\u95a2\u6570\u304c\u52d5\u4f5c\u3057\u306a\u3044\u53ef\u80fd\u6027\u304c\u308f\u305a\u304b\u306b\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u304cSQL\u5f0f\u306b\u95a2\u3059\u308b\u60c5\u5831\u3067\u3059\u3002\u5f8c\u306eSQL\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3084\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3053\u308c\u3089\u3092\u983b\u7e41\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u3055\u3089\u306a\u308b\u53c2\u8003\u8cc7\u6599\uff1aSQL\u30c7\u30fc\u30bf\u578b\u3002\u53c2\u7167\uff1aOracle\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
            SQL\u5f0f\u306f\u30011\u3064\u4ee5\u4e0a\u306e\u5024\u3001\u6f14\u7b97\u5b50\u3001SQL\u95a2\u6570\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3042\u308a\u3001\u5024\u306b\u7d50\u679c\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306eSQL\u5f0f\u306f\u3001\u30d5\u30a9\u30fc\u30df\u30e5\u30e9\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3042\u308a\u3001\u30af\u30a8\u30ea\u8a00\u8a9e\u3067\u8a18\u8ff0\u3055\u308c\u307e\u3059\u3002\u307e\u305f\u3001\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u30af\u30a8\u30ea\u3059\u308b\u305f\u3081 […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[14,26],"class_list":["post-345","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-14","tag-26"],"yoast_head":"\nSQL\u306e\u5f0f - 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