{"id":525,"date":"2014-12-18T13:44:45","date_gmt":"2014-12-18T04:44:45","guid":{"rendered":"http:\/\/www.dbsheetclient.jp\/blog\/?p=525"},"modified":"2018-06-27T16:22:03","modified_gmt":"2018-06-27T07:22:03","slug":"null%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"https:\/\/www.dbsheetclient.jp\/blog\/?p=525","title":{"rendered":"NULL\u306b\u3064\u3044\u3066"},"content":{"rendered":"

IT\u30b3\u30fc\u30c7\u30a3\u30cd\u30fc\u30bf\u306e\u30b7\u30e5\u30a6\u3067\u3059\u3002<\/p>\n

\"IMG_0556-crop2\"<\/a><\/p>\n

\u4f1a\u793e\u304b\u3089\u306e\u5e30\u5b85\u9014\u4e2d\u3067\u64ae\u3063\u305f\u672d\u5e4c\u884c\u304d\u5bdd\u53f0\u7279\u6025\u300c\u5317\u6597\u661f\u300d\u306e\u5199\u771f\u3067\u3059\u3002\u5317\u6597\u661f\u306f\u30d6\u30eb\u30fc\u30c8\u30ec\u30a4\u30f3\u3068\u3082\u8a00\u308f\u308c\u308b\u306e\u3067\u3001\u901a\u5e38\u306f\u9752\u8272\u3060\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u5199\u771f\u306f\u30ab\u30b7\u30aa\u30da\u30a2\u8272\u306e\u727d\u5f15\u6a5f\u3067\u3059\u306d\u3002
\u898b\u304b\u3051\u308b\u305f\u3073\u306b\u3001\u4e00\u5ea6\u306f\u4e57\u3063\u3066\u307f\u305f\u3044\u3068\u601d\u3063\u3066\u3044\u305f\u306e\u3067\u3059\u304c\u3001\u6765\u5e74\u4e2d\u306b\u306f\u5317\u6597\u661f\u304c\u5ec3\u6b62\u3055\u308c\u308b\u65b9\u91dd\u3068\u3044\u3046\u30cb\u30e5\u30fc\u30b9\u304c\u6d41\u308c\u3066\u3044\u307e\u3059\u3002\u6b8b\u5ff5\u3067\u3059\u306d\u3002
\u81ea\u5206\u3082\u3001\u7530\u820e\uff08\u5317\u6d77\u9053\u3067\u306f\u306a\u3044\u3067\u3059\u304c\uff09\u304b\u3089\u6771\u4eac\u306b\u521d\u3081\u3066\u5927\u5b66\u53d7\u9a13\u306b\u6765\u305f\u3068\u304d\u3001\u5bdd\u53f0\u7279\u6025\u3067\u6765\u305f\u3053\u3068\u3092\u4eca\u3082\u899a\u3048\u3066\u3044\u307e\u3059\u3002
\u4e00\u5ea6\u4e57\u3063\u3066\u307f\u305f\u304b\u3063\u305f\u306a\uff5e\uff01

\uff1c\u672c\u65e5\u306e\u984c\u6750\uff1e
NULL\u306b\u3064\u3044\u3066<\/strong><\/p>\n

NULL\u306f\u3001\u30c7\u30fc\u30bf\u304c\u5b58\u5728\u3057\u306a\u3044\uff08\u7a7a\u3067\u3042\u308b\uff09\u3068\u3044\u3046\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u304c\u3001\u30c7\u30fc\u30bf\u3092\u6271\u3046\u4e0a\u3067\u3001NULL\u3068\u3044\u3046\u306e\u306f\u3068\u304d\u306b\u975e\u5e38\u306b\u3084\u3063\u304b\u3044\u306a\u5b58\u5728\u3067\u3059\u306d\u3002\uff08NULL\u306f\u300c\u4e0d\u660e\u300d\u3068\u3044\u3046\u8a00\u8449\u3067\u8868\u73fe\u3059\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\uff09\u8aa4\u3063\u3066\u4f7f\u7528\u3059\u308b\u3068\u3001\u30c7\u30fc\u30bf\u304c\u6b63\u3057\u304f\u62bd\u51fa\u3055\u308c\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3092\u4f55\u5ea6\u3082\u7d4c\u9a13\u3057\u305f\u65b9\u3082\u3044\u3089\u3063\u3057\u3083\u308b\u3068\u601d\u3044\u307e\u3059\u3002
\u4eca\u65e5\u306f\u3001NULL\u3092\u6271\u3046\u969b\u306e\u6ce8\u610f\u70b9\u306b\u3064\u3044\u3066\u53d6\u308a\u4e0a\u3052\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n

\u00a0\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u793e\u54e1\u30de\u30b9\u30bf\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u6b69\u5408\u7d66\u306e\u30c7\u30fc\u30bf\u304c\u3042\u308b\u4eba\u3082\u3044\u308c\u3070\u3001NULL\u306e\u4eba\u3082\u3044\u308b\u72b6\u614b\u3067\u3059\u3002<\/p>\n

SELECT * FROM \u793e\u54e1\u30de\u30b9\u30bf
ORDER BY \u793e\u54e1\u756a\u53f7;
\"\u793e\u54e1\u30de\u30b9\u30bf\"<\/a><\/p>\n

<\/a>\u3053\u3053\u3067\u3001\u300c\u56fa\u5b9a\u7d66\u300d+\u300c\u6b69\u5408\u7d66\u300d\u304c\u305d\u306e\u4eba\u306e\u7d66\u4e0e\u3068\u306a\u308b\u306e\u3067\u3001\u7d66\u4e0e\u304c300000\u4ee5\u4e0a\u306e\u65b9\u3092\u51fa\u3059\u5834\u5408\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3057\u3066\u3057\u307e\u3046\u3068\u3001<\/p>\n

SELECT * FROM \u793e\u54e1\u30de\u30b9\u30bf
WHERE \u56fa\u5b9a\u7d66+\u6b69\u5408\u7d66 > 300000
ORDER BY \u793e\u54e1\u756a\u53f7;
\"\u793e\u54e1\u30de\u30b9\u30bf_null\u672a\u8003\u616e\"<\/a><\/p>\n

\u3068\u306a\u3063\u3066\u3057\u307e\u3044\u3001\u6c42\u3081\u305f\u3044\u4eba\u6570\u3088\u308a\u5c11\u306a\u3044\u7d50\u679c\u304c\u51fa\u307e\u3057\u305f\u3002\u56fa\u5b9a\u7d66\u304c 300000 \u4ee5\u4e0a\u3060\u3051\u308c\u3069\u3082\u3001\u6b69\u5408\u7d66\u304c NULL\u306e\u65b9\u304c\u62bd\u51fa\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002
\u8a66\u3057\u306b\u3001\u6b69\u5408\u7d66\u304cNULL\u306e\u65b9\u3092\u62bd\u51fa\u3059\u308b\u306e\u306b\u3001=NULL\u3068\u3057\u305f\u5834\u5408\u3001<\/p>\n

SELECT * FROM \u793e\u54e1\u30de\u30b9\u30bf
WHERE\u6b69\u5408\u7d66 = NULL;
\"\u793e\u54e1\u30de\u30b9\u30bf_=null\"<\/a>
<\/a>\u7d50\u679c\u306f1\u4ef6\u3082\u62bd\u51fa\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n

\u3053\u308c\u306f\u3001NULL\u306b\u5bfe\u3057\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6bd4\u8f03\u3092\u884c\u3046\u5f0f\u306f\u5168\u3066 unknown \u3068\u8a55\u4fa1\u3055\u308c\u3066\u3057\u307e\u3044\u3001true\u3068\u306a\u3089\u306a\u3044\u305f\u3081\u306b\u3001\u7d50\u679c\u304c\u62bd\u51fa\u3055\u308c\u3066\u3053\u306a\u3044\u306e\u3067\u3059\u3002<\/p>\n

\u9805\u76ee = NULL
\u9805\u76ee> NULL
\u9805\u76ee< NULL
\u9805\u76ee<> NULL
NULL = NULL<\/p>\n

\u3055\u3089\u306b\u3001\u9805\u76ee+NULL\u3001\u9805\u76ee-NULL\u3001\u9805\u76ee*NULL\u3001\u9805\u76ee\/NULL \u306a\u3069\u3001NULL\u3092\u542b\u3080\u7b97\u8853\u6f14\u7b97\u306f\u3059\u3079\u3066\u7d50\u679c\u3082 NULL \u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u6700\u521d\u306e\u4f8b\u306e\u3001\u7d66\u4e0e+\u6b69\u5408\u7d66\u306e\u5834\u5408\u3001\u6b69\u5408\u7d66\u304c NULL \u306e\u30c7\u30fc\u30bf\u306f\u8db3\u3057\u7b97\u306e\u7d50\u679c\u3082 NULL \u3068\u306a\u308a\u3001\u7d66\u4e0e+\u6b69\u5408\u7d66>300000 \u3068\u3044\u3046\u5f0f\u306f unknown \u3068\u306a\u3063\u3066\u3001\u62bd\u51fa\u7d50\u679c\u306b\u51fa\u3066\u6765\u306a\u304b\u3063\u305f\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n

\u305d\u308c\u3067\u306f\u3001NULL\u306e\u3082\u306e\u3092\u62bd\u51fa\u3059\u308b\u305f\u3081\u306b\u306f\u3069\u3046\u3059\u308b\u304b\u3068\u3044\u3046\u3068\u3001
\u300cIS NULL\u300d\u3068\u3044\u3046\u53e5\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n

SELECT * FROM \u793e\u54e1\u30de\u30b9\u30bf
WHERE \u6b69\u5408\u7d66 IS NULL;
\"\u793e\u54e1\u30de\u30b9\u30bf_isnull\"<\/a><\/p>\n

<\/a>\u53cd\u5bfe\u306b\u3001NULL\u3067\u306a\u3044\u3082\u306e\u3092\u62bd\u51fa\u3059\u308b\u306e\u306f\u3001\u300cIS NOT NULL\u300d\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n

SELECT * FROM \u793e\u54e1\u30de\u30b9\u30bf
WHERE \u6b69\u5408\u7d66 IS NOT NULL;
\"\u793e\u54e1\u30de\u30b9\u30bf_isnotnull\"<\/a>
<\/a>\u7d50\u679c\u3068\u3057\u3066\u306f\u3001\u5168\u3066\u62e0\u70b9\u304c\u30b7\u30ab\u30b4\u306e\u4eba\u3067\u3059\u3002<\/p>\n

<\/a>\u305d\u308c\u3067\u306f\u3001\u6700\u521d\u306e\u4f8b\u306b\u623b\u3063\u3066\u3001\u56fa\u5b9a\u7d66+\u6b69\u5408\u7d66\u304c300000\u4ee5\u4e0a\u306e\u65b9\u3092\u62bd\u51fa\u3057\u305f\u3044\u5834\u5408\u3001Oracle\u3067\u3042\u308c\u3070\u3001NVL\u95a2\u6570\u306a\u3069\u3092\u4f7f\u7528\u3057\u3066\u3001NULL\u3067\u3042\u308c\u3070\u6307\u5b9a\u3057\u305f\u5024\u3092\u623b\u3059\u3068\u3044\u3046\u95a2\u6570\u3092\u3088\u304f\u4f7f\u3044\u307e\u3059\u3002
NULL\u306e\u5834\u5408\u306f0\u3068\u307f\u306a\u305b\u3070\u3001\u3053\u306e\u6bd4\u8f03\u306f\u6210\u7acb\u3059\u308b\u306e\u3067\u3001
NVL(\u6b69\u5408\u7d66,0) \u3068\u8a18\u8ff0\u3057\u3066<\/p>\n

SELECT * FROM \u793e\u54e1\u30de\u30b9\u30bf
WHERE \u56fa\u5b9a\u7d66+NVL(\u6b69\u5408\u7d66,0) > 300000
ORDER BY \u793e\u54e1\u756a\u53f7;
\"\u793e\u54e1\u30de\u30b9\u30bf_nvl\"<\/a>
<\/a>\u6c42\u3081\u308b\u7d50\u679c\u304c\u51fa\u307e\u3057\u305f\u3002<\/p>\n

<\/a>\u3061\u306a\u307f\u306b\u3001SQL Server\u306e\u5834\u5408\u306b\u306f\u3001NVL\u95a2\u6570\u3067\u306f\u306a\u304f\u3001ISNULL\u95a2\u6570\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n

SELECT * FROM \u793e\u54e1\u30de\u30b9\u30bf
WHERE \u56fa\u5b9a\u7d66+ISNULL(\u6b69\u5408\u7d66,0) > 300000
ORDER BY \u793e\u54e1\u756a\u53f7;
\"\u793e\u54e1\u30de\u30b9\u30bf_isnull_sqlsv\"<\/a><\/p>\n

<\/a>\u7b97\u8853\u6f14\u7b97\u3068\u3044\u3046\u3053\u3068\u3067\u3001+, – *, \/ \u306a\u3069\u3092\u4e0a\u3052\u307e\u3057\u305f\u304c\u3001SUM\u3084AVG\u306a\u3069\u306e\u96c6\u8a08\u95a2\u6570\u3067\u3082\u540c\u69d8\u306b\u5f71\u97ff\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5404\u62e0\u70b9\u6bce\u306e\u3001
\u56fa\u5b9a\u7d66+\u6b69\u5408\u7d66\u306e\u5408\u8a08\u30fb\u5e73\u5747\u306a\u3069\u3092\u6c42\u3081\u305f\u3044\u5834\u5408\u306b\u3001NULL\u304c\u3042\u308b\u3068\u901a\u5e38\u306eSQL\u3067\u306f\u6b63\u3057\u3044\u7d50\u679c\u304c\u51fa\u307e\u305b\u3093\u3002<\/p>\n

SELECT \u62e0\u70b9, SUM(\u56fa\u5b9a\u7d66) \u56fa\u5b9a\u7d66\u8a08, SUM(\u6b69\u5408\u7d66) \u6b69\u5408\u7d66\u8a08
, SUM(\u56fa\u5b9a\u7d66+\u6b69\u5408\u7d66) \u7d66\u4e0e\u8a08, AVG(\u56fa\u5b9a\u7d66+\u6b69\u5408\u7d66) \u5e73\u5747\u7d66\u4e0e
, COUNT(\u6b69\u5408\u7d66) \u6b69\u5408\u7d66\u4eba\u6570, COUNT(*) \u4eba\u6570
FROM \u793e\u54e1\u30de\u30b9\u30bf
GROUP BY \u62e0\u70b9
ORDER BY \u62e0\u70b9;
\"\u793e\u54e1\u30de\u30b9\u30bf_sum1\"<\/a><\/p>\n

<\/a>\u56fa\u5b9a\u7d66+\u6b69\u5408\u7d66 \u306eSUM\u3001AVG\u3092\u8a08\u7b97\u3057\u3066\u3044\u308b\u7b87\u6240\u306e\u7d50\u679c\u304c\u6b63\u3057\u304f\u3042\u308a\u307e\u305b\u3093\u3002\u6b63\u3057\u3044\u5024\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u5148\u307b\u3069\u306e NVL\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

SELECT \u62e0\u70b9, SUM(\u56fa\u5b9a\u7d66) \u56fa\u5b9a\u7d66\u8a08
, SUM(NVL(\u6b69\u5408\u7d66,0)) \u6b69\u5408\u7d66\u8a08
, SUM(\u56fa\u5b9a\u7d66+NVL(\u6b69\u5408\u7d66,0)) \u7d66\u4e0e\u8a08
, AVG(\u56fa\u5b9a\u7d66+NVL(\u6b69\u5408\u7d66,0)) \u5e73\u5747\u7d66\u4e0e
, COUNT(\u6b69\u5408\u7d66) \u6b69\u5408\u7d66\u4eba\u6570, COUNT(*) \u4eba\u6570
FROM \u793e\u54e1\u30de\u30b9\u30bf
GROUP BY \u62e0\u70b9
ORDER BY \u62e0\u70b9;
\"\u793e\u54e1\u30de\u30b9\u30bf_sum2\"<\/a>
<\/a>\u5148\u307b\u3069\u3068\u7d50\u679c\u304c\u5909\u308f\u308a\u307e\u3057\u305f\u3002
<\/a>
SQL Server\u3067\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

SELECT \u62e0\u70b9, SUM(\u56fa\u5b9a\u7d66) \u56fa\u5b9a\u7d66\u8a08
, SUM(ISNULL(\u6b69\u5408\u7d66,0)) \u6b69\u5408\u7d66\u8a08
, SUM(\u56fa\u5b9a\u7d66+ISNULL(\u6b69\u5408\u7d66,0)) \u7d66\u4e0e\u8a08
, AVG(\u56fa\u5b9a\u7d66+ISNULL(\u6b69\u5408\u7d66,0)) \u5e73\u5747\u7d66\u4e0e
<\/span>, COUNT(\u6b69\u5408\u7d66) \u6b69\u5408\u7d66\u4eba\u6570, COUNT(*) \u4eba\u6570
<\/span>FROM \u793e\u54e1\u30de\u30b9\u30bf
<\/span>GROUP BY \u62e0\u70b9
<\/span>ORDER BY \u62e0\u70b9;<\/span><\/p>\n

\"\u793e\u54e1\u30de\u30b9\u30bf_sum2_sqlsv\"<\/a><\/p>\n

<\/a>\u4eca\u65e5\u306f\u4ee5\u4e0a\u307e\u3067
<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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