{"id":6859,"date":"2018-02-22T07:25:11","date_gmt":"2018-02-21T22:25:11","guid":{"rendered":"https:\/\/tetraup.com\/news_topics\/archives\/6859"},"modified":"2024-09-05T16:05:15","modified_gmt":"2024-09-05T07:05:15","slug":"sql-essentials-part6","status":"publish","type":"post","link":"https:\/\/tetraup.com\/news_topics\/column\/sql-essentials-part6\/","title":{"rendered":"\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u77e5\u3089\u306a\u3044\u3068\u30e4\u30d0\u30a4SQL Part6 \u301c\u4f3c\u3066\u975e\u306a\u308bTRUNCATE\u3068DROP\u301c"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n

\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u77e5\u3089\u306a\u3044\u3068\u30e4\u30d0\u30a4SQL Part6 \u301c\u4f3c\u3066\u975e\u306a\u308bTRUNCATE\u3068DROP\u301c<\/h2>\n

\u524d\u56de<\/a>\u306f\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u306e\u66f4\u65b0\u3068\u524a\u9664\u3092\u884c\u3046\u305f\u3081\u306e\u300cUPDATE\u300d\u3068\u300cDELETE\u300d\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u305f\u3002
\n\u4eca\u56de\u3001\u5b66\u3093\u3067\u3044\u304f\u306e\u306f\u524a\u9664\u3092\u884c\u3046\u305f\u3081\u306e\u300cTRUNCATE\u300d\u3068\u300cDROP\u300d\u3067\u3059\u3002<\/p>\n

Part1\u304b\u3089\u306e\u5185\u5bb9\u304c\u6c17\u306b\u306a\u308b\u65b9\u306f\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u77e5\u3089\u306a\u3044\u3068\u30e4\u30d0\u30a4SQL Part1<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n

\"\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u77e5\u3089\u306a\u3044\u3068\u30e4\u30d0\u30a4SQL\"<\/p>\n

\u524d\u56de\u306e\u304a\u3055\u3089\u3044<\/h2>\n

\u307e\u305a\u306f\u524d\u56de\u5b66\u3093\u3060\u300cUPDATE\u300d\u3068\u300cDELETE\u300d\u306b\u3064\u3044\u3066\u306e\u8efd\u3044\u304a\u3055\u3089\u3044\u3092\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

UPDATE
\n[sql]UPDATE t_employee SET name=’\u9b8e\u5ddd’AND age=’20’ WHERE no=5;[\/sql]<\/p>\n

DELETE
\n[sql]DELETE FROM t_employee WHERE no=5;[\/sql]<\/p>\n

\u3053\u306e\u3088\u3046\u306b\u3057\u3066\u66f8\u304f\u306e\u304c\u300cUPDATE\u300d\u3068\u300cDELETE\u300d\u3067\u3059\u3002\u3053\u3061\u3089\u304b\u3089\u524d\u56de\u306e\u5fa9\u7fd2\u304c\u3067\u304d\u307e\u3059\u2192\u524d\u56de\u306e\u8a18\u4e8b<\/a><\/p>\n

\u4eca\u56de\u306e\u5185\u5bb9<\/h2>\n

\u4eca\u56de\u5b66\u3076\u306e\u306f\u300cTRUNCATE\u300d\u3068\u300cDROP\u300d\u3068\u3044\u3046\u524a\u9664\u306b\u95a2\u3059\u308b\u69cb\u6587\u3067\u3059\u3002
\n\u300c\u3048\u3063\uff1f\u524a\u9664\u306fDELETE\u3092\u4f7f\u3046\u3093\u3058\u3083\u306a\u3044\u306e\uff1f\u4f55\u304c\u9055\u3046\u306e\uff1f\u300d\u3068\u601d\u308f\u308c\u308b\u65b9\u3082\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002
\n\u524a\u9664\u3092\u3059\u308b\u3068\u3044\u3046\u70b9\u3067\u306f\u4e09\u3064\u3068\u3082\u540c\u3058\u3067\u3059\u304c\u5b9f\u306f\u307e\u3063\u305f\u304f\u9055\u3046\u3082\u306e\u306a\u3093\u3067\u3059\u3002<\/p>\n

\u3057\u3063\u304b\u308a\u628a\u63e1\u305b\u305a\u306b\u4f7f\u3063\u3066\u9867\u5ba2\u306e\u30c7\u30fc\u30bf\u3092\u5168\u3066\u6d88\u3057\u3066\u3057\u307e\u3063\u305f\u2026\u306a\u3093\u3066\u3053\u3068\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u3053\u3053\u3067\u3057\u3063\u304b\u308a\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002
\n\"\"<\/p>\n

\u300cTRUNCATE\u300d\u3063\u3066\uff1f<\/h2>\n

TRUNCATE\u3092\u4f7f\u3046\u3068\u30c6\u30fc\u30d6\u30eb\u3092\u524a\u9664\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002
\n\u4e0b\u306e\u3088\u3046\u306b\u3057\u3066\u4f7f\u3063\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n

[sql]TRUNCATE TABLE (\u30c6\u30fc\u30d6\u30eb\u540d);[\/sql]<\/p>\n

\u3053\u306e\u3088\u3046\u306b\u66f8\u304f\u3053\u3068\u3067\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u62ec\u3067\u6d88\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u69cb\u9020\u306f\u6d88\u3055\u305a\u306b\u6b8b\u3057\u3066\u304a\u3044\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n

DELETE\u6587\u3067\u3082\u30c6\u30fc\u30d6\u30eb\u3092\u4e00\u62ec\u3067\u6d88\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001TRUNCATE\u306e\u65b9\u304c\u9ad8\u901f\u3067\u51e6\u7406\u3092\u884c\u3063\u3066\u304f\u308c\u307e\u3059\u3002
\n\u30c6\u30fc\u30d6\u30eb\u306e\u5168\u90e8\u306e\u884c\u3092\u4e00\u62ec\u3067\u6d88\u3059\u3082\u306e\u306e\u3001WHERE\u53e5\u3067\u306e\u6307\u5b9a\u306f\u3067\u304d\u306a\u3044\u3068\u3044\u3046\u3068\u3053\u308d\u3082DELETE\u3068\u306e\u9055\u3044\u306b\u306a\u308a\u307e\u3059\u3002
\n\u203bDBMS\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u304c\u3001MySQL\u3067\u306f\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\uff08\u5fa9\u5143\uff09\u304c\u51fa\u6765\u307e\u305b\u3093\u3002<\/p>\n

\u5b9f\u969b\u306b\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n

\u3053\u308c\u304c\u3082\u3068\u306e\u300ct_employee\u300d\u30c6\u30fc\u30d6\u30eb\u3067\u3059<\/p>\n

\"\"<\/p>\n

\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u8fbc\u3080\u3068
\n[sql]TRUNCATE TABLE t_employee;[\/sql]<\/p>\n

\u69cb\u9020\u3060\u3051\u6b8b\u3057\u3066\u5168\u90e8\u306e\u30c7\u30fc\u30bf\u304c\u6d88\u3048\u307e\u3059\u3002
\n\"\"
\n\u30c7\u30fc\u30bf\u304c\u7a7a\u3063\u307d\u3067\u3059\u3001\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u3057\u305f\u304c\u3063\u3066\u3001
\n\u30fb\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u62ec\u3067\u65e9\u304f\u6d88\u3057\u305f\u3044
\n\u30fb\u30c6\u30fc\u30d6\u30eb\u306e\u69cb\u9020\u306f\u6d88\u3055\u305a\u306b\u6b8b\u3057\u3066\u304a\u304d\u305f\u3044
\n\u3068\u3044\u3046\u6642\u306b\u4f7f\u3048\u307e\u3059\u3002<\/b><\/p>\n

DROP\u3063\u3066\uff1f<\/h2>\n

DROP\u306f\u540c\u3058\u304f\u30c7\u30fc\u30bf\u3092\u4e00\u62ec\u3067\u6d88\u3057\u3066\u304f\u308c\u308b\u6587\u3067\u3059\u3002
\n\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002
\n[sql]DROP TABLE (\u30c6\u30fc\u30d6\u30eb\u540d);[\/sql]<\/p>\n

TRUNCATE\u3068\u540c\u3058\u304f\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u6319\u306b\u6d88\u3057\u3066\u304f\u308c\u307e\u3059\u3002
\nTRUNCATE\u3068\u9055\u3046\u3068\u3053\u308d\u306f\u30c6\u30fc\u30d6\u30eb\u306e\u69cb\u9020\u81ea\u4f53\u3082\u6b8b\u3057\u3066\u304f\u308c\u306a\u3044\u3068\u3044\u3046\u3068\u3053\u308d\u3067\u3059\u3002
\n\u203b\u3053\u308c\u3082DBMS\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u304c\u3001MySQL\u3067\u306f\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\uff08\u5fa9\u5143\uff09\u304c\u51fa\u6765\u307e\u305b\u3093\u3002<\/p>\n

\u3053\u308c\u3082\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n

\u3082\u3046\u4e00\u5ea6\u3053\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u7528\u3044\u307e\u3059\u3002
\n\"\"<\/p>\n

\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304f\u3068
\n[sql]DROP TABLE t_employee;[\/sql]<\/p>\n

\u69cb\u9020\u3054\u3068\u30c7\u30fc\u30bf\u304c\u6d88\u3048\u307e\u3059\u3002
\n\"\"
\n\u300ct_employee\u300d\u3068\u3044\u3046\u30c6\u30fc\u30d6\u30eb\u305d\u306e\u3082\u306e\u304c\u3042\u308a\u307e\u305b\u3093\u3068\u3044\u3046\u98a8\u306b\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n

\u3057\u305f\u304c\u3063\u3066\u3001
\n\u30fb\u30c6\u30fc\u30d6\u30eb\u306e\u69cb\u9020\u3054\u3068\u4e00\u62ec\u3067\u6d88\u3057\u305f\u3044
\n\u3068\u3044\u3046\u6642\u306b\u4f7f\u3048\u307e\u3059\u3002<\/b><\/p>\n

\u307e\u3068\u3081<\/h2>\n

\u3044\u304b\u304c\u3067\u3057\u305f\u3067\u3057\u3087\u3046\u304b\uff1f
\n\u30fbTRUNCATE\u3068DROP\u306f\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u3092\u4e00\u6319\u306b\u6d88\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3002
\n\u30fb\u9055\u3044\u306f\u69cb\u9020\u3092\u6b8b\u3057\u3066\u304f\u308c\u308b\u304b\u3069\u3046\u304b
\n\u30fb\u3069\u3061\u3089\u3082MySQL\u3067\u306f\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u3067\u304d\u306a\u3044<\/b>
\n\u3068\u3044\u3046\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<\/p>\n

\u6b21\u56de\u306f\u30c6\u30fc\u30d6\u30eb\u3068\u30c6\u30fc\u30d6\u30eb\u3092\u7d50\u5408\u3055\u305b\u308b\u300cJOIN\u300d\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>","protected":false},"excerpt":{"rendered":"

\u975e\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u3082\u77e5\u3089\u306a\u3044\u3068\u30e4\u30d0\u30a4SQL Part6 \u301c\u4f3c\u3066\u975e\u306a\u308bTRUNCATE\u3068DROP\u301c \u524d\u56de\u306f\u30c6\u30fc\u30d6\u30eb\u306e\u30c7\u30fc\u30bf\u306e\u66f4\u65b0\u3068\u524a\u9664\u3092\u884c\u3046\u305f\u3081\u306e\u300cUPDATE\u300d\u3068\u300cDELETE\u300d\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u305f\u3002 \u4eca\u56de\u3001\u5b66\u3093\u3067\u3044\u304f\u306e\u306f\u524a\u9664 […]<\/p>\n","protected":false},"author":2,"featured_media":9298,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[37],"tags":[],"class_list":["post-6859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-column"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/posts\/6859","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/comments?post=6859"}],"version-history":[{"count":2,"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/posts\/6859\/revisions"}],"predecessor-version":[{"id":9299,"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/posts\/6859\/revisions\/9299"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/media\/9298"}],"wp:attachment":[{"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/media?parent=6859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/categories?post=6859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tetraup.com\/news_topics\/wp-json\/wp\/v2\/tags?post=6859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}