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john123 avatar image
john123 asked

how to use cast,in mysql when union is used

how to apply cast for 'meterscount', when applying cast it is showing the error illegal mix of collations in 'union'. (SELECT StartNo,Category,Label,User FROM ShowData WHERE SelectList=5) UNION (SELECT '','','',CONCAT('Meter Subtotal: ',MetersCount));
mysqlunioncollation
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eghetto answered
(SELECT StartNo ,Category ,Label ,User FROM ShowData WHERE SelectList = 5) UNION (SELECT CAST('' AS ?) -- replace ? by data type of 'StartNo'! ,CAST('' AS ?) -- replace ? by data type of 'Category'! ,CAST('' AS ?) -- replace ? by data type of 'Label'! ,CAST(CONCAT('Meter Subtotal: ', MetersCount)) AS ?); -- replace ? by data type of 'User'!
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KenJ avatar image KenJ commented ·
And, if the collation doesn't match between the column in your table and the collation of the value coming out of the cast, you can cast using a specific character set - http://dev.mysql.com/doc/refman/5.0/en/charset-convert.html
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