Saturday, December 16, 2017

MYSQL Group Concat Select Some Selected Rows Only | Use Sort In Group Concat | Sort MySQL Rows in Group Concat

Its so simple. Just need to do below thins:
SELECT SUBSTRING_INDEX(GROUP_CONCAT(x.id ORDER BY x.nx DESC), ',', 2) as row_name from some_table GROUP BY some_field
It will select First two values only.
It total value of GROUP_CONCAT is "1,2,3,4,5" Then Using SUBSTRING_INDEX would be like "1,2"
You can use DISTINCT in GROUP_CONCAT function like
SUBSTRING_INDEX(DISTINCT(GROUP_CONCAT(x.id ORDER BY x.nx DESC)), ',', 2)

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