SQL子字符串问题

Question

Hi I have a column called mix which is as follows

120
102 201
300
234 212
11 21

So the issue is I want to extract the digits of the left when a space is found, I am trying that with substring as shown below, I wonder why it is not working.

 select mix,  
 SUBSTRING(mix,1,CHARINDEX(' ',mix)-1)
 FROM tbl_xx
 where CHARINDEX(mix,' ')>0

Answer 1

Find string comes first in CHARINDEX ... Change it in WHERE condition

SELECT mix, SUBSTRING(mix, 1, CHARINDEX(' ',mix) - 1)
FROM   tbl_xx
WHERE  CHARINDEX(' ', mix) > 0

Answer 2

Try this

select mix,  
 SUBSTRING(mix,1,CHARINDEX(' ',mix)-1)
 FROM tbl_xx
 where CHARINDEX(' ',mix)>0

Your where clause charindex is wrong check the above

Answer 3

Use LEFT

select mix,LEFT(mix,CHARINDEX(' ',mix)-1)
 FROM tabl
 where CHARINDEX(' ',mix)>0