{"id":975,"date":"2021-01-25T01:43:17","date_gmt":"2021-01-24T16:43:17","guid":{"rendered":"https:\/\/skyit.biz\/?p=975"},"modified":"2021-01-25T01:43:18","modified_gmt":"2021-01-24T16:43:18","slug":"%e7%ac%ac6%e7%ab%a0%e3%82%b0%e3%83%ab%e3%83%bc%e3%83%97%e9%96%a2%e6%95%b0%e3%81%a8%e3%83%87%e3%83%bc%e3%82%bf%e3%81%ae%e9%9b%86%e8%a8%88","status":"publish","type":"post","link":"https:\/\/skyit.biz\/?p=975","title":{"rendered":"\u7b2c6\u7ae0\t\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u3068\u30c7\u30fc\u30bf\u306e\u96c6\u8a08"},"content":{"rendered":"\n

\u25a0COUNT\u95a2\u6570<\/p>\n\n\n\n

COUNT(*)
“COUNT(\u5f0f)
\u307e\u305f\u306fCOUNT(ALL \u5f0f)”
COUNT(DISTINCT \u5f0f)<\/p>\n\n\n\n

\u25a0LISTAGG\u95a2\u6570<\/p>\n\n\n\n

\u9023\u7d50\u3057\u305f\u7d50\u679c\u3092\u623b\u3059\u95a2\u6570<\/p>\n\n\n\n

LISTAGG(\u9023\u7d50\u3057\u3066\u8868\u793a\u3059\u308b\u5217\u540d)
WITHIN GROUP(ORDER BY \u30bd\u30fc\u30c8\u5217\u540d [DESC])<\/p>\n\n\n\n

\u25a0GROUP BY \u53e5\u306b\u3088\u308b\u30c7\u30fc\u30bf\u306e\u30b0\u30eb\u30fc\u30d7\u5316
SELECT\u6587\u306e\u5217\u30ea\u30b9\u30c8\u306b\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u304c\u3042\u308b\u5834\u5408\u306f\u3001GROUP BY\u53e5\u306b\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u3067\u306f\u306a\u3044\u5217\u540d\u306f\u3001\u5168\u3066\u8a18\u8f09\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/p>\n\n\n\n

WITHIN GROUP<\/p>\n\n\n\n

\u25a0\u91cd\u8981
GROUP BY\u53e5\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u884c\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3067\u304d\u308b\u3002
GROUP BY\u53e5\u306f\u3001WHERE\u53e5\u306e\u5f8c\u308d\u3001\u304b\u3064ORDER BY\u53e5\u306e\u524d\u306b\u6307\u5b9a\u3059\u308b\u3002
GROUP BY\u53e5\u306b\u5217\u5225\u540d\u306f\u6307\u5b9a\u3067\u304d\u306a\u3044\u3002
SELECT\u53e5\u306e\u9078\u629e\u30ea\u30b9\u30c8\u306b\u306f\u3001GROUP BY\u53e5\u3067\u6307\u5b9a\u3057\u305f\u5217\u3068\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u306e\u307f\u6307\u5b9a\u3067\u304d\u308b\u3002
ORDER BY\u53e5\u306b\u306f\u3001GROUP BY\u53e5\u3067\u6307\u5b9a\u3057\u305f\u5217\u3068\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u306e\u307f\u6307\u5b9a\u3067\u304d\u308b\u3002
\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u306f\u3001\u6700\u59272\u30ec\u30d9\u30eb\u307e\u3067\u30cd\u30b9\u30c8\u3067\u304d\u308b\u3002
GROUP BY\u53e5\u306b\u6307\u5b9a\u3057\u305f\u5217\u3092SELECT\u53e5\u306e\u30ea\u30b9\u30c8\u306b\u6307\u5b9a\u3057\u306a\u304f\u3066\u3082\u3001\u30a8\u30e9\u30fc\u306b\u306f\u306a\u3089\u306a\u3044\u3002<\/p>\n\n\n\n

WHERE\u53e5\u3067\u306f\u3001\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u3092\u4f7f\u3046\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3002
SELECT\u53e5\u306e\u4e2d\u3067\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u3068\u4e00\u7dd2\u306b\u500b\u3005\u306e\u5217\uff08\u307e\u305f\u306f\u5f0f\uff09\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u3001\u305d\u306e\u5217\uff08\u307e\u305f\u306f\u5f0f\uff09\u3092GROUP BY\u53e5\u3067\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002
\u4f8b\uff09
SELECT DEPTNO, AVG(SAL) FROM EMP;
\u4e0a\u8a18\u306f\u30a8\u30e9\u30fc\u3068\u6210\u308b\u3002GROUP BY\u53e5\u3067DEPTNO\u3092\u6307\u5b9a\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002
GROUP BY\u53e5\u3067\u306f\u3001\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u3092\u4f7f\u3048\u306a\u3044\u3002\u4f7f\u3046\u3068\u30a8\u30e9\u30fc\u3068\u6210\u308b\u3002
GROUP BY\u53e5\u3067\u306f\u3001\u5217\u5225\u540d\u3092\u4f7f\u7528\u3067\u304d\u306a\u3044\u3002ORDER BY\u53e5\u3067\u306f\u3001\u5217\u5225\u540d\u3092\u4f7f\u7528\u3067\u304d\u308b\u3002<\/p>\n\n\n\n

<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

RPAD\u95a2\u6570\u306f\u3001\u5358\u4e00\u884c\u95a2\u6570\u306e\u6587\u5b57\u95a2\u6570\u3067\u3042\u308b\u3002<\/p>\n\n\n\n

\u25a0COUNT\u95a2\u6570
COUNT(*)\u306f\u3001NULL\u5730\u3092\u542b\u3080\u5168\u884c\u6570\u3092\u623b\u3059\u3002
COUNT(ALL \u5217\u540d)\u3001COUNT(\u5217\u540d)\u306f\u3001NULL\u5730\u3092\u9664\u304f\u884c\u6570\u3092\u623b\u3059\u3002<\/p>\n\n\n\n

COUNT(DISTINCT \u5217\u540d)\u306f\u3001NULL\u5024\u3092\u9664\u304d\u3001\u91cd\u8907\u5024\u306f\uff11\u3064\u306b\u96c6\u7d04\u3057\u3066\u4ef6\u6570\u3092\u51fa\u3059\u3002<\/p>\n\n\n\n

\u65e5\u4ed8\u306e\u5927\u5c0f\u306f\u3001\u53e4\u3044\u65e5\u4ed8\u304b\u3089\u65b0\u3057\u3044\u65e5\u4ed8\u306b\u5411\u304b\u3063\u3066\u3001\u5c0f\u304b\u3089\u5927\u3068\u306a\u3063\u3066\u3044\u304f\u3002
MIN(\u65e5\u4ed8)\u306f\u3001\u6700\u3082\u53e4\u3044\u65e5\u4ed8\u3092\u51fa\u3059\u3002
MAX(\u65e5\u4ed8)\u306f\u3001\u3082\u3068\uff34\u3082\u65b0\u3057\u3044\u65e5\u4ed8\u3092\u51fa\u3059\u3002<\/p>\n\n\n\n

MAX(\u6587\u5b57\u5217)\u306e\u5834\u5408\u306f\u3001A<Z\u3068\u306a\u308b\u3002
MIN(\u6587\u5b57\u5217)\u306e\u5834\u5408\u306f\u3001A<Z\u3068\u306a\u308b\u3002<\/p>\n\n\n\n

\u25a0LISTAGG\u30b0\u30eb\u30fc\u30d7\u95a2\u6570
LISTAGG\u30b0\u30eb\u30fc\u30d7\u95a2\u6570\u306f\u3001\u6307\u5b9a\u3055\u308c\u305f\u30e1\u30b8\u30e3\u30fc\u5217\u306b\u3064\u3044\u3066\u3001ORDER BY\u53e5\u306e\u6307\u5b9a\u306e\u9806\u5e8f\u3067\u3001\u30e1\u30b8\u30e3\u30fc\u5217\u306e\u5024\u3092\u7d50\u5408\u3059\u308b\u3002
\u7d50\u5408\u3059\u308b\u3001\u9023\u7d50\u3059\u308b\u3001\u30ea\u30b9\u30c8\u3059\u308b\u3068\u3082\u8868\u73fe\u3059\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u25a0COUNT\u95a2\u6570 COUNT(*)“COUNT(\u5f0f)\u307e\u305f\u306fCOUNT(ALL \u5f0f)”COUNT(DISTINCT \u5f0f) \u25a0LISTAGG\u95a2\u6570 \u9023\u7d50\u3057\u305f\u7d50\u679c\u3092\u623b\u3059\u95a2\u6570 LISTAGG(\u9023\u7d50\u3057\u3066\u8868\u793a\u3059 […]<\/p>\n","protected":false},"author":1,"featured_media":976,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38,52,12],"tags":[],"class_list":{"0":"post-975","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-bronze-dba-12c","8":"category-bronze-sql-12c","9":"category-oracle"},"_links":{"self":[{"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/posts\/975","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=975"}],"version-history":[{"count":1,"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/posts\/975\/revisions"}],"predecessor-version":[{"id":977,"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/posts\/975\/revisions\/977"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/media\/976"}],"wp:attachment":[{"href":"https:\/\/skyit.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}