select\r\ndatetime('2021-01-01') as DATETIME1,\r\ncast('2021-01-01' as datetime) as DATETIME2,\r\nparse_datetime('%Y-%m-%d', '2021-01-01') as DATETIME3,<\/code><\/pre>\n <\/p>\n
\u3069\u308c\u3082\u9069\u5207\u306b\u30ad\u30e3\u30b9\u30c8\u3067\u304d\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n![\"\"](\"https:\/\/gri.jp\/media\/wp\/wp-content\/uploads\/2022\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2022-04-14-14.02.58-1024x432.png\")
\n
<\/p>\n
\u4f8b\u5916\u304c\u5165\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u306e\u30ad\u30e3\u30b9\u30c8\u306b\u95a2\u3057\u3066<\/h2>\n
\u305d\u308c\u306a\u308a\u306e\u30dc\u30ea\u30e5\u30fc\u30e0\u304c\u3042\u308b\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u3066\u3001\u4e0a\u306e\u3088\u3046\u306a\u611f\u3058\u3067\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u308b\u3068\u3001\u307b\u307c\u9593\u9055\u3044\u306a\u304f\u3053\u3051\u307e\u3059\u3002\u4f8b\u5916\u3092\u51e6\u7406\u3067\u304d\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n
\u4f8b\u3048\u3070datetime()\u95a2\u6570\u3060\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30a8\u30e9\u30fc\u3092\u5410\u304d\u307e\u3059\u3002<\/p>\n![\"\"](\"https:\/\/gri.jp\/media\/wp\/wp-content\/uploads\/2022\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2022-04-14-14.07.01-1024x592.png\")
\n
\u305d\u306e\u5834\u5408\u4ee5\u4e0b\u306e\u4e8c\u3064\u3092\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002\u3068\u3044\u3046\u304b\u521d\u3081\u304b\u3089\u3053\u3061\u3089\u63a8\u5968\u3067\u3059\u3002<\/p>\n
\uff08\uff12\uff09’ safe_cast()\u95a2\u6570
\n\uff08\uff13\uff09’ safe.parse_datetime()\/safe.parse_timestamp()\u95a2\u6570<\/p>\n
\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30af\u30a8\u30ea\u3092\u53e9\u304f\u3068<\/p>\n
select\r\nsafe_cast('2021-01-01' as datetime) as DATETIME1,\r\nsafe.parse_datetime('%Y-%m-%d', '2021-01-01') as DATETIME2\r\nunion all\r\nselect\r\nsafe_cast('hoge' as datetime) as DATETIME1,\r\nsafe.parse_datetime('%Y-%m-%d', 'hoge') as DATETIME2<\/code><\/pre>\n <\/p>\n
\u4f8b\u5916\u306b\u95a2\u3057\u3066\u306f\u9069\u5207\u306bnull\u306b\u306a\u3063\u3066\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n![\"\"](\"https:\/\/gri.jp\/media\/wp\/wp-content\/uploads\/2022\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2022-04-14-14.12.28-1024x721.png\")
\n
<\/p>\n
\u5f62\u5f0f\u304c\u63c3\u3063\u3066\u3044\u306a\u3044\u5834\u5408\u306e\u30ad\u30e3\u30b9\u30c8<\/h2>\n
\u3053\u3093\u306a\u611f\u3058\u306e\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u306d\u3002CASE\u6587\u3092\u66f8\u3044\u3066\u51e6\u7406\u3059\u308b\u611f\u3058\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u2026\u2026\u3068\u30c7\u30e2\u3092\u898b\u305b\u3088\u3046\u304b\u306a\u301c\u3068\u601d\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u3084\u3081\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3082\u3046\u30c7\u30fc\u30bf\u683c\u7d0d\u306e\u6642\u306b\u63c3\u3048\u307e\u3057\u3087\u3046\u3002\u30c7\u30fc\u30bf\u3092\u53d6\u308a\u76f4\u305b\u306a\u3044\u306a\u3069\u306e\u4e8b\u60c5\u304c\u3042\u308b\u306e\u3067\u3042\u308c\u3070\u3057\u3087\u3046\u304c\u306a\u3044\u306e\u3067\u3059\u304c\uff08\u9811\u5f35\u3063\u3066\u304f\u3060\u3055\u3044\u2026\u2026\uff09\u3001\u3053\u3093\u306a\u72b6\u614b\u306e\u307e\u307e\u30c7\u30fc\u30bf\u3092\u6301\u3063\u3066\u3044\u3061\u3083\u30c0\u30e1\u3067\u3059\u3001\u30c0\u30e1\u7d76\u5bfe\u3002<\/p>\n
with t as (\r\n select '2021-01-01' as STRING union all \r\n select '20210101' as STRING,\r\n)\r\n\r\nselect *\u3000from t<\/code><\/pre>\n <\/p>\n![\"\"](\"https:\/\/gri.jp\/media\/wp\/wp-content\/uploads\/2022\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2022-04-14-14.18.19.png\")
\n
<\/p>\n
\u7d50\u8ad6\u3081\u3044\u305f\u3053\u3068<\/h2>\n
\u30c7\u30fc\u30bf\u578b\u3068\u3044\u3046\u306e\u306f\u5384\u4ecb\u306a\u3082\u306e\u3067\u3059\u3002\u4eba\u9593\u304c\u898b\u308b\u5206\u306b\u306f\u898b\u305f\u76ee\u306f\u540c\u3058\u3067\u3042\u308b\u306b\u3082\u95a2\u308f\u3089\u305a\u3001\u9069\u5f53\u306b\u3084\u3063\u3066\u3044\u308b\u3068\u671b\u3093\u3060\u7d50\u679c\u306b\u306a\u3089\u306a\u3044\u3002\u300c\u6240\u8a6e\u30c7\u30fc\u30bf\u578b\u3067\u3057\u3087\uff1f\u672c\u8cea\u3058\u3083\u306a\u3044\u3063\u3066\u300d\u306a\u3069\u3068\u758e\u304b\u306b\u3057\u3066\u3044\u308b\u3068\u3001\u81ea\u5206\u306e\u3088\u3046\u306a\u4e00\u7d1a\u30cf\u30de\u30ea\u30b9\u30c8\u4e00\u76f4\u7dda\u3067\u3059\u3002\u3053\u306e\u9053\u306f\u8fbf\u3063\u3066\u306f\u3044\u3051\u306a\u3044\u2026\u2026\uff08\u81ea\u5206\u3078\u306e\u6212\u3081\uff09<\/p>\n
\u843d\u3061\u7740\u3044\u3066\u51e6\u7406\u3059\u308c\u3070\u78ba\u5b9f\u306b\u3067\u304d\u308b\u3053\u3068\u306a\u306e\u3067\u3001\u843d\u3061\u7740\u304d\u307e\u3057\u3087\u3046\u3002
\n\u4f8b\u5916\u304c\u3042\u3063\u3066\u3082\u3001\u30c7\u30fc\u30bf\u304c\u5927\u304d\u304f\u3066\u30b9\u30ad\u30e3\u30f3\u91cf\u306b\u30d3\u30d3\u3063\u3066\u3044\u3066\u3082\u3001\u843d\u3061\u7740\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n
\u307e\u305f\u578b\u306f\u3061\u3083\u3093\u3068\u610f\u8b58\u3057\u307e\u3057\u3087\u3046\u3002\u4eba\u9593\u306b\u3068\u3063\u3066\u306f\u540c\u3058\u898b\u3048\u65b9\u3067\u3082\u6a5f\u68b0\u306b\u3068\u3063\u3066\u306f\u5168\u304f\u7570\u306a\u308b\u3082\u306e\u3067\u3059\u3002\uff08\u81ea\u5206\u3078\u306e\u6212\u3081\uff09<\/p>\n
\u305d\u3057\u3066\u3001\u81ea\u5206\u306b\u3068\u3063\u3066\u306f\u3069\u3093\u306a\u306b\u81ea\u660e\u3067\u3042\u3063\u3066\u3082\u5b9a\u7fa9\u66f8\u306f\u6b8b\u3057\u307e\u3057\u3087\u3046\u3002\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u304c\u3069\u3053\u306a\u306e\u304b\uff1f\u578b\u306f\u306a\u3093\u306a\u306e\u304b\uff1f\u5206\u6790\u3057\u3066\u3044\u308b\u3068\u3064\u3044\u3064\u3044\u758e\u304b\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u304c\u3001\u9577\u671f\u7684\u306b\u898b\u308b\u3068\u81ea\u5206\u306b\u3068\u3063\u3066\u3082\u6642\u9593\u77ed\u7e2e\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u306a\u305c\u306a\u3089\u4eca\u306e\u81ea\u5206\u306b\u3068\u3063\u3066\u81ea\u660e\u3067\u3042\u3063\u3066\u3082\u672a\u6765\u306e\u81ea\u5206\u306f\u4ed6\u4eba\u3060\u304b\u3089\u3067\u3059\u3002\u30bf\u30a4\u30e0\u30be\u30fc\u30f3\u306a\u3093\u3060\u3063\u3051\uff1f\u3068\u78ba\u5b9f\u306b\u5fd8\u308c\u307e\u3059\u3002\uff08\u81ea\u5206\u3078\u306e\u6212\u3081\uff09<\/p>\n
<\/p>\n
\u3088\u308a\u30a2\u30c9\u30d0\u30f3\u30b9\u306a\u65e5\u6642\u30c7\u30fc\u30bf\u578b\u306e\u30cf\u30de\u308a\u30dd\u30a4\u30f3\u30c8<\/h2>\n
\u500b\u4eba\u7684\u306b\u306f<\/p>\n
\n- \u300c25\u6642\u300d\u306a\u3069\u65e5\u4ed8\u3092\u8d85\u3048\u3066\u3044\u3066\u3082\u3001\uff08\u4eba\u9593\u76ee\u7dda\u3067\uff09\u540c\u4e00\u65e5\u4ed8\u3068\u3057\u3066\u6271\u3046\u5834\u5408<\/li>\n<\/ul>\n
\u304c\u30a2\u30c9\u30d0\u30f3\u30b9\u304b\u3064\u3088\u304f\u3042\u308b\u304b\u3064\u30cf\u30de\u308a\u305d\u3046\u306a\u30dd\u30a4\u30f3\u30c8\u3060\u306a\u3068\u601d\u3044\u307e\u3059\u3002
\n\u6c17\u304c\u5411\u3044\u305f\u3089\u3053\u306e\u8fba\u306e\u3053\u3068\u3082\u66f8\u304d\u305f\u3044\u306a\u3068\uff08\u66f8\u304f\u3068\u306f\u8a00\u3063\u3066\u306a\u3044\uff09\u3002<\/p>\n
<\/p>\n
\u81ea\u5206\u3078\u306e\u6212\u3081\u3070\u304b\u308a\u3067\u3042\u307e\u308a\u53d6\u308a\u7559\u3081\u304c\u306a\u3044\u3067\u3059\u304c\u4ee5\u4e0a\u3067\u3059\u3002
\n\u3069\u306a\u305f\u304b\u306e\u53c2\u8003\u306b\u306a\u308c\u3070\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u30c7\u30fc\u30bf\u5206\u6790\u5b98\u306e\u6642\u9593\u3092\u6eb6\u304b\u3059\u9b54\u306e\u4e8c\u5927\u5de8\u982d\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u305d\u3046\u3001\u300c\u65e5\u6642\u30c7\u30fc\u30bf\u578b\u300d\u3068\u300cNULL\u300d\u3067\u3059\u3002\u5f7c\u3089\u306f\u5e38\u306b\u305d\u306e\u6a5f\u4f1a\u3092\u3046\u304b\u304c\u3044\u3001\u9699\u3042\u3089\u3070\u6211\u3005\u306e\u6642\u9593\u3092\u5208\u308a\u53d6\u308a\u306b\u304d\u307e\u3059\u3002\u3080\u3057\u308d\u547d\u3092\u5208\u308a\u53d6\u308b\u5f62\u3092\u3057\u3066\u3044\u307e\u3059\u3002 \u305d\u306e\u3046\u3061\u4eca\u56de\u306f\u3001\u7279\u306bB<\/p>\n","protected":false},"author":20,"featured_media":5105,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,138],"tags":[],"class_list":["post-6544","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-datascience","category-tips"],"acf":[],"meta_field":{"_edit_lock":["1698030100:44"],"_edit_last":["44"],"hidden_toppage":["0"],"_hidden_toppage":["field_61933136630d2"],"note_url":[""],"_note_url":["field_61243c8278b90"],"_oembed_cdd8eba8359a4d4728635e840dba0334":["{{unknown}}"],"_oembed_fcb9b01e34be6e6922d9117fd834fffc":["{{unknown}}"],"_oembed_28249623c539f4d7b9d44cf21dc1ec09":["{{unknown}}"],"_oembed_6652c395474309977fbf308fe60d119a":["{{unknown}}"],"_oembed_bacbf24f13fd3cfa80669904cf6c4396":["{{unknown}}"],"_oembed_363fe328f8854611ccb693c8272b4cee":["{{unknown}}"],"_thumbnail_id":["5105"],"_wp_old_date":["2022-04-14","2022-04-15"],"_pv_count":["a:24:{i:15;i:4620;i:17;i:4225;i:23;i:793;i:11;i:3906;i:12;i:2792;i:14;i:4248;i:16;i:4410;i:10;i:3561;i:13;i:3521;i:20;i:1416;i:22;i:959;i:8;i:730;i:18;i:3133;i:19;i:2124;i:21;i:1201;i:4;i:154;i:3;i:231;i:9;i:1992;i:5;i:172;i:6;i:163;i:1;i:544;i:0;i:521;i:7;i:288;i:2;i:310;}"],"pv_count":["46007"],"recommend_posts":["\u304a\u3059\u3059\u3081\u8a18\u4e8b\u306b\u3059\u308b"]},"_links":{"self":[{"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/posts\/6544","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/comments?post=6544"}],"version-history":[{"count":18,"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/posts\/6544\/revisions"}],"predecessor-version":[{"id":31932,"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/posts\/6544\/revisions\/31932"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/media\/5105"}],"wp:attachment":[{"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/media?parent=6544"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/categories?post=6544"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gri.jp\/media\/wp-json\/wp\/v2\/tags?post=6544"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}