1
getdate
dateadd
datediff
datename
datepart
day
month
year
2
cast
convert
3
三种
标量函数 sql 返回值
内联表值函数 查询语句 返回表
多语句表值函数 sql 返回表
4
1
select datediff(day,‘2000/1/1’,getdate()),
datediff(month,‘2000/1/1’,getdate()),
datediff(yy,‘2000/1/1’,getdate())
2
select dateadd(day,100,getdate()),
dateadd(day,-100,getdate())
3
select substring(‘you are a student’,11,7)
4
select len(‘you are a student’)
5
select LEFT(‘i am a teacher and you are students’,14),right(‘i am a teacher and you are students’,16)
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