solve mysql query problem

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SQL

CONCAT(MONTHNAME(i.time), ' ', YEAR(i.time), c.categoryName)

Error Code: 1271. Illegal mix of collations for operation 'concat'

Posted 30-Oct-14 1:52am

Navi.jsp

Updated 30-Oct-14 3:18am

King Fisher

v3

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Herman<T>.Instance 30-Oct-14 8:02am

what collations are used for table i and c ?

[no name] 30-Oct-14 8:02am

is it MySQL or SQL Server or what ???

Navi.jsp 30-Oct-14 9:04am

mysql server

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King Fisher · Answer 1 · 2014-10-30T03:23:00

Solution 1

Refer this :

http://www.experts-exchange.com/Programming/Languages/Scripting/PHP/Q_26634253.html[^]

Posted 30-Oct-14 3:23am

King Fisher

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Navi.jsp 30-Oct-14 10:18am

i am using java and mysql

King Fisher 31-Oct-14 0:13am

you mentioned it's in MySQL Query

Maciej Los · Answer 2 · 2014-10-30T10:56:00

Please, see the answer posted by eggyal: http://stackoverflow.com/questions/3029321/troubleshooting-illegal-mix-of-collations-error-in-mysql[^]

As per i understand you can't mix numeric and string values. You need to convert/cast it to string

SQL

SELECT CONCAT(MONTHNAME(i.time), ' ', CONVERT(CHAR(4), YEAR(i.time)), c.categoryName) AS NewColName
FROM ...

Another reason is different collation for each table. You can workaround it by using CONVERT function.

SQL

SELECT CONVERT(c.categoryName USING utf8) AS Utf8CategoryName