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第一个比第二个性能高。
查询语句意义:
如果codelist中tablecode配置为0时,
t.Table_Code = ‘SV_RETURN_BILL‘不生效。
如果codelist中tablecode配置为1时
条件t.Table_Code = ‘SV_RETURN_BILL‘生效
SELECT * FROM Sm_Affix t WHERE t.Record_Id = 865904162 AND (t.Table_Code = ‘SV_RETURN_BILL‘ OR (SELECT COUNT(*) FROM Ad_Lov_Code_v t WHERE t.List_Code = ‘SM_AFFIX‘ AND t.Lov_Code = ‘TABLECODE‘ AND t.Lov_Name = ‘0‘) = 1); SELECT * FROM Sm_Affix t WHERE t.Record_Id = 865904162 AND (t.Table_Code = ‘SV_RETURN_BILL‘ OR (SELECT t.Lov_Name FROM Ad_Lov_Code_v t WHERE t.List_Code = ‘SM_AFFIX‘ AND t.Lov_Code = ‘TABLECODE‘) = ‘0‘);
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原文地址：http://www.cnblogs.com/chenv/p/5774294.html
