Sql_Case_When用法
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http://wenku.baidu.com/link?url=XBnkUzGtiJFhTnQk5HbmdgndhVEYJdcfDEhSEIFeTRn9-41KMLf_49wKiydNCF-4g3QiMc5n5tmn0mvgIZBxVc3BXdjk61OKKO3iIX0_FNS