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    <pre><code>insert into table2 values('1,2,3'); </code></pre> <p>most likely needs to be</p> <pre><code>insert into table2 values('1'); insert into table2 values('2'); insert into table2 values('3'); </code></pre> <p>Then, your sub select <code>select field2 from table2</code> returns <code>('1', '2', '3')</code>, and the <code>IN</code> operator can be used to check if the result of the corresponding field from the main select is contained in this set.</p> <hr> <p>According to the comments, the same schema seems to have worked before. I am not aware that the <code>IN</code> operator can be used like in the question, and splitting of column values into a row set seems to be non-trivial. </p> <p>Using the <code>FIND_IN_SET()</code> function as proposed by @KaeL, the following query should work:</p> <pre><code>SELECT b.* FROM table2 a INNER JOIN table1 b ON FIND_IN_SET(b.field1, a.field2) &gt; 0; </code></pre> <p>See also</p> <ul> <li><a href="https://stackoverflow.com/questions/11463090/single-mysql-field-with-comma-separated-values">Single MySQL field with comma separated values</a></li> <li><a href="http://sqlfiddle.com/#!2/795f8/10" rel="nofollow noreferrer">Sample query on SQLFiddle</a></li> </ul> <hr> <p>In any case, you should consider normalizing your schema - using string lists as values of single fields can usually be much better handled by a relational database when the separate values are stored in separate rows in a separate table.</p> <p><a href="http://sqlfiddle.com/#!2/797cc/3" rel="nofollow noreferrer">http://sqlfiddle.com/#!2/797cc/3</a> shows a possible solution.</p>
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    1. POMysql IN stopped working on 5.1
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    1. USCommunity
    1. USAndreas Fester
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    1. COBut I only have 1 row to compare against. i.e A row for 1 person contains a field of shoe sizes, 8,9,10 and I want to check if the value 9 is in the field.
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      1. USAnonymous
    2. COOk, so that means that the schema (create) and the data (insert) as you have shown in your question is correct?
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      1. USAndreas Fester
    3. COYes and this did work in an older version of Mysql.
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