<\/span><\/h2>\n\n\n\nDECODE(value,value1,result1, value2,result2, value3,result3,... , result)<\/code><\/pre>\n\n\n\n<\/span>\u8bf4\u660e<\/span><\/h2>\n\n\n\n\u7c7b\u4f3c\u4e8e CASE value WHEN value1 THEN result1 ....\uff0c\u552f\u4e00\u533a\u522b\u662f\u5982\u679c value \u4e3aNULL \u503c\uff0c\u53ef\u4ee5\u548c\u540e\u9762\u7684 NULL \u503c\u5339\u914d\u3002<\/p>\n\n\n\n
<\/span>\u6837\u4f8b<\/span><\/h2>\n\n\n\n<\/span>\u6570\u503c\u662f\u6210\u5bf9\u5339\u914d\u7684\uff0c\u4e14\u6709\u9ed8\u8ba4\u503c\u3002<\/span><\/h3>\n\n\n\ngbase> select decode(1,0,'Zero',1,'First',2,'Second','Other');\r\n+-------------------------------------------------+\r\n| decode(1,0,'Zero',1,'First',2,'Second','Other') |\r\n+-------------------------------------------------+\r\n| First |\r\n+-------------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n<\/code><\/pre>\n\n\n\n<\/span>\u6ca1\u6709\u9ed8\u8ba4\u503c<\/span><\/h3>\n\n\n\n\u4e0d\u5f71\u54cd\u5339\u914d\u7ed3\u679c\uff0c\u4f46\u5219\u4e0d\u5339\u914d\u65f6\u8fd4\u56deNULL<\/p>\n\n\n\n
gbase> select decode(1,0,'Zero',1,'First',2,'Second');\r\n+-----------------------------------------+\r\n| decode(1,0,'Zero',1,'First',2,'Second') |\r\n+-----------------------------------------+\r\n| First |\r\n+-----------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n\r\ngbase> select decode(11,0,'Zero',1,'First',2,'Second');\r\n+------------------------------------------+\r\n| decode(11,0,'Zero',1,'First',2,'Second') |\r\n+------------------------------------------+\r\n| NULL |\r\n+------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n<\/code><\/pre>\n\n\n\n<\/span>\u5339\u914dNULL<\/span><\/h3>\n\n\n\ngbase> select decode(null,0,'Zero',1,'First',2,'Second',null,'NULL_VALUE','Other');\r\n+----------------------------------------------------------------------+\r\n| decode(null,0,'Zero',1,'First',2,'Second',null,'NULL_VALUE','Other') |\r\n+----------------------------------------------------------------------+\r\n| NULL_VALUE |\r\n+----------------------------------------------------------------------+\r\n1 row in set (Elapsed: 00:00:00.00)\r\n<\/code><\/pre>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
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