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I have this stored procedure with out parameter (code):

SELECT code = RIGHT(CONCAT(REPEAT(0, 6), (SELECT MAX(CONVERT(code, int)) + 1 FROM enterprises)), 6)

If I exec it, return null value, but if I execute the single query, it works right. Why?

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  • Can you show full procedure? Commented Apr 7, 2017 at 15:02

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Rename parameter, try to write something like this (parameter name code_param) -

SELECT
  RIGHT(CONCAT(REPEAT(0, 6), (SELECT MAX(CONVERT(code, int)) + 1 FROM enterprises)), 6)
INTO code_param;
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