SELECT * FROM table WHERE column LIKE '%\%%' OR column LIKE '%$%' OR column LIKE '%&%';
... etc .. '% char%' means that there is char somewhere, '% char' means that char is at the end of the line, 'char%' means that it is at the beginning. '% \ %%' means that the char search (%) is the special char used by mysql, and '\' is necessary.
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