php - I have comma seperated column and need to get most common values from them in mysql -

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i have comma separated value in mysql table field , want common value amongst them.

i.e. have table name a, in there 2 fields id , available_values.

 id    available_values  ---   -----------------  1     3,5,7,9  2     3,5  3     5,9

in above example there value 5 exist in rows need value(mean - 5), because available in every records.

please find out solution.

thanks in advance.

best way include table 1 row per id , values. can use regexp achieve output : 

select * table_name available_values regexp concat('(^|,)(', replace(5,',','|'),')(,|$)')

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