常用sql语句

常用sql语句

1.将字段前四位替换

update [TDCBJYQSN].[dbo].[XZQH] set XZQHBM ='5405'+substring(XZQHBM,5, len(XZQHBM)) WHERE left(XZQHBM,4)='5422'

 2.从一个表中查询数据，保存进另一个表中

  INSERT INTO [TDCBJYQSN].[dbo].[XZQH]  select [QSDWMC],[QSDWDM] FROM [XZQH].[dbo].[QSDWDMB]

 3.将乡镇的行政区划代码改为9位

update QSDWDMB set QSDWDM = SUBSTRING(QSDWDM,1,12) where QSDWDM like '540521%' and SUBSTRING(QSDWMC,LEN(QSDWMC),1) in ('镇','乡')

持续更新中~~~~

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