--时间函数: SELECT DATEADD(YEAR,10,GETDATE()) select DATEDIFF(year,getdate(),getdate()) SELECT DATENAME(month,GETDATE()) SELECT DATEPART(MONTH,GETDATE()) SELECT DAY(GETDATE()) SELECT GETDATE() SELECT GETUTCDATE() SELECT MONTH(GETDATE()) SELECT YEAR(GETDATE()) --数学运算函数: SELECT ABS(CONVERT(INT,-123548545)) SELECT FLOOR(1.12) SELECT CEILING(1.12) SELECT PI() SELECT POWER(100,-1) SELECT RAND(0.12) SELECT ROUND(1.254,1) --字符串函数: SELECT ASCII('A') SELECT CHAR(65) SELECT CHARINDEX('ik','MIKE') SELECT LEFT('MIKE',2) SELECT LEN('MIKE ') SELECT LOWER('miKE') SELECT LTRIM(' MIKE') SELECT NCHAR('97') SELECT PATINDEX('%CH%','mikechang') SELECT REPLACE('MIKECHANG','ch','SPRIT') SELECT len(REPLICATE('mi',10)) SELECT REVERSE('mikesoft') SELECT RIGHT('MIKESOFT',3) SELECT RTRIM('MIKESOFT ') SELECT LEN(SPACE(10)) SELECT STR(123.215,1,2) SELECT STUFF('mikechang',2,3,'sprite') SELECT SUBSTRING('mikechang',2,3) SELECT UNICODE('KE') SELECT UPPER('mike') --系统函数 SELECT APP_NAME() SELECT COALESCE(NULL,NULL,100) SELECT CURRENT_USER SELECT DATALENGTH(' MIKEC ') SELECT @@ERROR SELECT HOST_ID() SELECT HOST_NAME() SELECT @@IDENTITY SELECT NEWID() SELECT ISDATE('20132')