选择从第一个开始的地方而不是mysql

Question

I tried to make a research but just from prefixe.

Eg. when I search 10542 , 110542 shouldn't be there, just 105428001 .

The string :

110542004
105428001 

I tried

LEFT(INV.INV_CD,5) LIKE '%".$option3."%'";

and

SUBSTRING(INV.INV_CD,1,5) LIKE '%".$option3."%'";

Both result are the same.

Answer 1

The problem is your LIKE syntax :

LIKE '%".$option3."%'";

When you use % it means you can have something at the same place, so LIKE '%".$option3."%'"; you can return value with XXXX + $option3 + XXXX (with XXXX equal to nothing or multiple char)

If you only want $option3 + XXXX , just write LIKE '".$option3."%'";

Here is the documentation about this :

With LIKE you can use the following two wildcard characters in the pattern:

% matches any number of characters, even zero characters.

_ matches exactly one character.

Answer 2

When you have a % in your like clause, this allows any characters, so one at the begining allows it to start anywhere. Remove it to start at the begning...

INV.INV_CD LIKE '".$option3."%'";

Note: You should also try to use prepared statements as they can stop a lot of problems in the future!