how to use LIKE with column name

Question

Normally LIKE statement used to check the pattern like data.

ex:

select * from table1 where name like 'ar%'

My problem is to use one column of table with LIKE statement.

ex:

select * from table1, table2 where table1.x is like table2.y%

Query above creates error creates . how to use one column data in like query?

Answer 1

...
WHERE table1.x LIKE table2.y + '%'

Answer 2

You're close.

The LIKE operator works with strings (CHAR, NVARCHAR, etc). so you need to concattenate the '%' symbol to the string...

MS SQL Server:

SELECT * FROM table1,table2 WHERE table1.x LIKE table2.y + '%'

Use of LIKE, however, is often slower than other operations. It's useful, powerful, flexible, but has performance considerations. I'll leave those for another topic though :)

EDIT:

I don't use MySQL, but this may work...

SELECT * FROM table1,table2 WHERE table1.x LIKE CONCAT(table2.y, '%')

Answer 3

declare @LkeVal as Varchar(100)
declare @LkeSelect Varchar(100)

Set @LkeSelect = (select top 1 <column> from <table> where <column> = 'value')
Set @LkeVal = '%' + @LkeSelect

select * from <table2> where <column2> like(''+@LkeVal+'');