<\/span><\/h2>\n\n\n\n\u67e5\u8be2\u4efb\u610f\u4e00\u5217\u4e3aNULL \uff0c\u6216\u8005\u4e3a\u4e00\u4e2a\u6307\u5b9a\u5b57\u7b26\u4e32\uff0c\u6bd4\u5982'<ERROR>'\u7684\u6570\u636e\u884c\u3002<\/p>\n\n\n\n
\u6211\u8fd9\u91cc\u75282\u5217\u505a\u4e2a\u793a\u4f8b<\/p>\n\n\n\n
gbase> select * from t1;\n+------+-------+\n| id | name |\n+------+-------+\n| NULL | First |\n| 222 | NULL |\n| 333 | Third |\n+------+-------+\n3 rows in set (Elapsed: 00:00:00.00)<\/code><\/pre>\n\n\n\n<\/span>\u666e\u901a\u5b9e\u73b0 IS NULL<\/span><\/h2>\n\n\n\n\u7528\u591a\u4e2aIS NULL\u7684OR\u6761\u4ef6\u6765\u5b9e\u73b0\uff0c\u770b\u4e0a\u53bb\u8bed\u6cd5\u660e\u786e\uff0c\u5f88\u5bb9\u6613\u7406\u89e3\u3002<\/p>\n\n\n\n
gbase> select * from t1 where id is null or name is null;\n+------+-------+\n| id | name |\n+------+-------+\n| NULL | First |\n| 222 | NULL |\n+------+-------+\n2 rows in set (Elapsed: 00:00:00.00)\n<\/code><\/pre>\n\n\n\n<\/span>IN\u7684\u5199\u6cd5<\/span><\/h2>\n\n\n\n\u6570\u503c IN (\u5b57\u6bb5\u5217\u8868) \u8fd9\u4e2a\u5199\u6cd5\uff0c\u6211\u8fd8\u662f\u7b2c\u4e00\u6b21\u7528\u3002\u6ce8\u610fNULL\u4e0d\u7b49\u4e8e\u4efb\u4f55\u503c\uff0c\u5982\u4e0b\u5df2\u7ecf\u5c06NULL\u8f6c\u6210\u4e86\u7a7a\u5b57\u7b26\u4e32''\u6765\u64cd\u4f5c\u3002<\/p>\n\n\n\n
gbase> select * from t1 where '' in(nvl(id,''),nvl(name,''));\n+------+-------+\n| id | name |\n+------+-------+\n| NULL | First |\n| 222 | NULL |\n+------+-------+\n2 rows in set (Elapsed: 00:00:00.01)\n<\/code><\/pre>\n\n\n\n\u540c\u6837\u7684\uff0c\u5176\u5b83\u503c\u4e5f\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n\n\n\n
gbase> select * from t1 where '222' in(id,name);\n+------+------+\n| id | name |\n+------+------+\n| 222 | NULL |\n+------+------+\n1 row in set (Elapsed: 00:00:00.00)\n\ngbase> select * from t1 where 'First' in(id,name);\n+------+-------+\n| id | name |\n+------+-------+\n| NULL | First |\n+------+-------+\n1 row in set (Elapsed: 00:00:00.01)\n<\/code><\/pre>","protected":false},"excerpt":{"rendered":"\u4eca\u5929\u624d\u53d1\u73b0\u4e86in\u7684\u4e00\u4e2a\u7528\u6cd5\uff0c\u5728GBase 8a\u91cc\u505a\u4e86\u5b9e\u9a8c\uff0c\u53ef\u4ee5\u8ba9\u4e00\u4e2a\u503cin\u4e00\u7ec4\u5217\u6765\u5b9e\u73b0\uff1a\u4efb\u610f\u4e00\u5217\u7b49\u4e8e\u503c\u5c31\u8fd4\u56de\u7684\u65b9\u6cd5\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-6618","post","type-post","status-publish","format-standard","hentry","category-gbase8a"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/6618","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=6618"}],"version-history":[{"count":5,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/6618\/revisions"}],"predecessor-version":[{"id":6623,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/6618\/revisions\/6623"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=6618"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=6618"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=6618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}