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1，trunc--convert

 oracle: select trunc(sysdate) from dual   输出：2016/5/24

 sql server:select CONVERT(varchar(100), GETDATE(), 111) 输出：2016/05/24

2，to_char--datename

oracle:select to_char(sysdate,‘day‘)  from dual; 输出星期二

sql server:Select datename(weekday, getdate());输出星期二

3 ROWNUM--SQL server行号

oracle:select ROWNUM from dual

sql server:select row_number()over(order by userid )as ROWNUM,*from Table

4 trunc--Convert--ROUND

oracle:select trunc(123.4586743,5) from dual 输出：123.45867

sql server:select  Convert(decimal(18,5),123.4586743) 输出123.45867

sql server：select ROUND(123.4586743,5)输出123.4586700

5 取三十天的时间

oracle:

SELECT (TRUNC(sysdate - 30) + (ROWNUM - 1)) as rq
FROM dual
CONNECT BY ROWNUM <= TRUNC(sysdate) - TRUNC(sysdate-30) + 1;

sql server:

select CONVERT(varchar(100), dateadd(dd,number,getdate()-30), 111) AS date
from master..spt_values
where type=‘p‘ and dateadd(dd,number,getdate()-30)<=getdate()

输出

oracle 与sql server 部分内置函数替换

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原文地址：http://www.cnblogs.com/wangboke/p/5524412.html