How to Use `LIKE` in MySQL JOIN Queries?

Performing MySQL Join Query using LIKE

In MySQL, if you encounter difficulties using a join query with the LIKE operator, consider the following:

The original MySQL join query provided in your post:

SELECT *
FROM Table1
INNER JOIN Table2 ON Table1.col LIKE '%' + Table2.col + '%'

Unfortunately, this query is not valid in MySQL. To achieve the desired LIKE search, try the following:

SELECT *
FROM Table1
INNER JOIN Table2 ON Table1.col LIKE CONCAT('%', Table2.col, '%')

MySQL handles string concatenation differently from other databases. Instead of using the || operator (commonly used for concatenation), use the CONCAT() function to combine the wildcard (%) with the column value.

This modification ensures that the query will perform the intended LIKE search successfully in MySQL. Remember to adjust your query accordingly if you wish to port your application to different databases due to the varying concatenation operators used in each system.

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