![\"\"](\"https:\/\/skyit.biz\/wp-content\/uploads\/2021\/01\/1.png\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/skyit.biz\/wp-content\/uploads\/2021\/01\/2.png\")
<\/figure>\n\n\n\n\u25bcE-R\u30e2\u30c7\u30eb\u306e\u4e3b\u8981\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8
\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\uff08\u5b9f\u4f53\uff09
\u5c5e\u6027\uff08\u30a2\u30c8\u30ea\u30d3\u30e5\u30fc\u30c8\uff09
\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\uff08\u95a2\u9023\uff09<\/p>\n\n\n\n
\u4e0a\u8a183\u3064\u306e\u69cb\u6210\u8981\u7d20\u3092\u7528\u3044\u3066\u3001\u6982\u5ff5\u5316\u3057\u305f\u30c7\u30fc\u30bf\u30e2\u30c7\u30eb\u306e\u3053\u3068\u3002
E-R\u30e2\u30c7\u30eb\u306b\u3068\u3044\u3066\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u3001\u7ba1\u7406\u306e\u5bfe\u8c61\u3092\u6307\u3057\u3001\u30a2\u30c8\u30ea\u30d3\u30e5\u30fc\u30c8\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u5b9f\u4f53\u306b\u5099\u308f\u308b\u7279\u6027\u3084\u4ed8\u968f\u7684\u306a\u8981\u7d20\u3092\u6307\u3059\u3002
\u30ea\u30ec\u30fc\u30b7\u30e7\u30f3\u30b7\u30c3\u30d7\u306f\u3001\u5b9f\u4f53\u3068\u5b9f\u4f53\u3068\u306e\u76f8\u4e92\u95a2\u4fc2\u3092\u8868\u3059\u3002<\/p>\n\n\n\n
\u25bc\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8
\u8868<\/p>\n\n\n\n
SQL\u306f\u3001\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7528\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9\u8a00\u8a9e\u3067\u3042\u308b\u3002
\u305d\u306e\u4ed6\u306e\u968e\u5c64\u578b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u578b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u306f\u3001\u305d\u308c\u305e\u308c\u5225\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9\u8a00\u8a9e\u3084\u540d\u524d\u304c\u3042\u308b\u3002<\/p>\n\n\n\n
SQL\u306f\u3001\u7c73\u56fd\u898f\u683c\u5354\u4f1a\uff08ANSI\uff09\u3001\u4e16\u754c\u6a19\u6e96\u5316\u6a5f\u69cb\uff08ISO\uff09\u306a\u3069\u306b\u3088\u3063\u3066\u3001\u6a19\u6e96\u5316\u3055\u308c\u3066\u3044\u308b\u3002
Oracle\u306f\u3001\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0(RDBMS)\u3067\u3042\u308b\u3002
SQL\u306f\u3001Structured Query Language\u306e\u7565\u79f0\u3067\u3042\u308b\u3002<\/p>\n\n\n\n
Oracle Cloud\u306f\u3001\uff13\u3064\u306e\u30bf\u30a4\u30d7\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u3002
SaaS
PaaS
IaaS<\/p>\n\n\n\n
\u7528\u8a9e \u6982\u8981
\u8868(TABLE) 2\u6b21\u5143\u306e\u914d\u5217\u69cb\u9020\u3092\u6301\u3064\u30c7\u30fc\u30bf\u3092\u7ba1\u7406\u3059\u308b\u5358\u4f4d\u3002\u8868\u306b\u306f\u8868\u540d\u304c\u3042\u308b\u3002
\u884c(ROW) \u8868\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b1\u4ef6\u306e\u30c7\u30fc\u30bf\u3002\u30ec\u30b3\u30fc\u30c9\u3068\u3082\u547c\u3076\u3002
\u5217(COLUMN) \u5404\u30c7\u30fc\u30bf\u884c\u5185\u3067\u4fdd\u6301\u3059\u308b\u9805\u76ee\u3002\u5217\u306b\u306f\u5217\u540d\u304c\u3042\u308b\u3002
\u30d5\u30a3\u30fc\u30eb\u30c9 \u884c\u3068\u5217\u304c\u4ea4\u5dee\u3059\u308b\u3002\u5024\u3092\u683c\u7d0d\u3059\u308b\u90e8\u5206\u3002\u5404\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f\u3001\u5024\u30921\u3064\u3060\u3051\u683c\u7d0d\u3067\u304d\u308b\u3002
NULL\u5024 \u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u5024\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u306a\u3044\u72b6\u614b\u3092\u8868\u3059\u7279\u6b8a\u306a\u5024\u3002\u7a7a\u767d\uff08\u30b9\u30da\u30fc\u30b9\uff09\u3084\u6570\u5024\u306e0(\u30bc\u30ed)\u3068\u306f\u533a\u5225\u3055\u308c\u308b\u3002<\/p>\n\n\n\n
\u25bc\u4e3b\u30ad\u30fc
\u4e3b\u30ad\u30fc\u3068\u306f\u3001\u8868\u5185\u306e\u884c\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u305f\u3081\u306e\u5217\uff08\u307e\u305f\u306f\u3001\u5217\u306e\u7d44\u5408\u305b\uff09\u306e\u3053\u3068\u3002\uff11\u3064\u306e\u8868\u306b\uff11\u3064\u3060\u3051\u8a2d\u5b9a\u3067\u304d\u308b\u3002
\u4e3b\u30ad\u30fc\u306b\u306f\u3001\u91cd\u8907\u3057\u305f\u5024\u3092\u683c\u7d0d\u3057\u305f\u308a\u3001NULL\u5024\u3092\u542b\u3081\u305f\u308a\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3002
\u3057\u305f\u304c\u3063\u3066\u3001\u4e3b\u30ad\u30fc\u306e\u5024\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\uff11\u3064\u306e\u884c\u3092\u7279\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n
\u25bc\u5916\u90e8\u30ad\u30fc
\u5916\u90e8\u30ad\u30fc\u3068\u306f\u3001\u540c\u3058\u8868\u307e\u305f\u306f\u3001\u4ed6\u306e\u8868\u306e\u4e3b\u30ad\u30fc\uff08\u307e\u305f\u306f\u4e00\u610f\u30ad\u30fc\uff09\u3092\u53c2\u7167\u3059\u308b\u5217\uff08\u307e\u305f\u306f\u5217\u306e\u7d44\u5408\u305b\uff09\u306e\u3053\u3068\u3002
\u5916\u90e8\u30ad\u30fc\u306e\u5217\u306b\u683c\u7d0d\u3067\u304d\u308b\u5024\u306f\u3001\u53c2\u7167\u5148\u306e\u5217\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u5024\u306e\u307f\u306b\u5236\u9650\u3055\u308c\u308b\u3002
\u5916\u90e8\u30ad\u30fc\u306e\u5217\u306b\u306fNULL\u5024\u3092\u542b\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n
\u25bc\u4e00\u610f\u30ad\u30fc
\u4e00\u610f\u30ad\u30fc\u3068\u306f\u3001\u91cd\u8907\u3057\u305f\u5024\u3092\u683c\u7d0d\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u306a\u3044\u5217\uff08\u307e\u305f\u306f\u3001\u5217\u306e\u7d44\u5408\u305b\uff09\u306e\u3053\u3068\u3002
\u4e3b\u30ad\u30fc\u306e\u5217\u306b\u306f\u3001NULL\u5024\u3092\u542b\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u304c\u3001\u4e00\u610f\u30ad\u30fc\u306e\u5217\u306b\u306f\u3001NULL\u5024\u3092\u542b\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002
\u307e\u305f\u3001\u4e3b\u30ad\u30fc\u306f1\u3064\u306e\u8868\u306b\uff11\u3064\u3057\u304b\u8a2d\u5b9a\u3067\u304d\u306a\u3044\u304c\u3001\u4e00\u610f\u30ad\u30fc\u306f\u30011\u3064\u306e\u8868\u306b\u8907\u6570\u8a2d\u5b9a\u304c\u3067\u304d\u308b\u3002<\/p>\n\n\n\n
\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u305f\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u3001\u6761\u4ef6\u3092\u6307\u5b9a\u3059\u308b\u3068\u304d\u306f\u3001WHERE\u53e5\u3067\u306f\u306a\u304f\u3001HAVING\u53e5\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3002
HAVING\u53e5\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u305f\u526f\u554f\u5408\u305b\u5bfe\u5fdc<\/p>\n\n\n\n
SELECT ID,LAST_NAME,SALARY
FROM DB4
WHERE LAST_NAME BETWEEN ‘A’ AND ‘B’ A\u306e\u540d\u524d\u306e\u307f\u51fa\u529b\u3068\u306a\u308b\u306e\u3067\u3001\u8981\u6ce8\u610f
AND SALARY BETWEEN 2000 AND 2500; BETWEEN 2000 AND 2500\u306f\u3001
SALARY >= 2000 AND SALARY <= 2500\u3068\u540c\u3058\u610f\u5473\u3068\u306a\u308b\u3002<\/p>\n\n\n\n
1.2\u3000SQL\u306e\u6982\u8981
SQL(Structured Query Language\uff1a\u69cb\u9020\u5316\u554f\u5408\u305b\u8a00\u8a9e)
SQL\u306f\u3001\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u8a00\u8a9e\u3067\u3042\u308b\u3002
SQL\u306e\u57fa\u672c\u69cb\u6587\u306f\u3001
ANSI(\u7c73\u56fd\u898f\u683c\u5354\u4f1a)
ISO(\u56fd\u969b\u6a19\u6e96\u5316\u6a5f\u69cb)
JIS(\u65e5\u672c\u5de5\u696d\u898f\u683c)
\u306a\u3069\u3067\u6a19\u6e96\u898f\u683c\u5316\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n\n\n\n
EM Express (Oracle Enterprise Manager Database Express)
GUI\u3092\u4f7f\u7528\u3057\u305f\u7ba1\u7406\u30c4\u30fc\u30eb\u3067\u3042\u308a\u3001\u753b\u9762\u304b\u3089\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3002\u5185\u90e8\u7684\u306b\u306f\u3001SQL\u6587\u304c\u81ea\u52d5\u7684\u306b\u751f\u6210\u3055\u308c\u3066\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u30ea\u30ec\u30fc\u30b7\u30e7\u30ca\u30eb\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306f\u3001\u884c\u3068\u5217\u304b\u3089\u69cb\u6210\u3055\u308c\u308b2\u6b21\u5143\u306e\u8868\u5f62\u5f0f\u3067\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3059\u308b\u3002\u4e3b\u30ad\u30fc\u306f\u5404\u884c\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u3002\u4e00\u610f\u30ad\u30fc\u306f\u3001NULL\u5024\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u5404\u884c\u3092\u4e00\u610f\u306b\u8b58\u5225\u3059\u308b\u306b\u306f\u4e0d\u8db3\u3067\u3042\u308b\u3002NOT NULL\u3092\u5408\u308f\u305b\u306a […]<\/p>\n","protected":false},"author":1,"featured_media":959,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54,12],"tags":[],"class_list":{"0":"post-958","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-bronze-sql","8":"category-oracle"},"_links":{"self":[{"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/posts\/958","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=958"}],"version-history":[{"count":1,"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/posts\/958\/revisions"}],"predecessor-version":[{"id":961,"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/posts\/958\/revisions\/961"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=\/wp\/v2\/media\/959"}],"wp:attachment":[{"href":"https:\/\/skyit.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=958"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=958"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/skyit.biz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}