How to Pass Variables to IN Clauses in SQL: A Workaround Using FIND_IN_SET

Passing Variables to IN Clauses

It can be desirable to pass a variable containing a list of values to an IN clause in a SQL statement. However, this functionality is not inherently supported in some programming languages. This article explores a workaround using the FIND_IN_SET function.

Example Scenario

Consider the following stored procedure with a SELECT statement:

<code class="sql">SELECT product_id, product_price
FROM product 
WHERE product_type IN ('AA','BB','CC');</code>

The goal is to pass a single variable, input_variables, containing the string of values ('AA,BB,CC') to the WHERE clause.

Using FIND_IN_SET

To accomplish this, pass the parameter value as a comma-separated string: 'AA,BB,CC'. Then, utilize the FIND_IN_SET function:

<code class="sql">SELECT product_id, product_price
FROM product
WHERE FIND_IN_SET(product_type, param);</code>

The FIND_IN_SET function returns 1 if the specified string is found in the set, and 0 if it is not. Therefore, the WHERE clause only returns rows where the product_type column matches one of the values in the param variable.

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