php - display result of field using *** at first 3 characters when condition is met in sql query -

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i have table :

username   |   status aaa        |   pending bbbbbbb    |   pending cccc       |   cancelled dddddddd   |   cancelled eeeeee     |   approved ffffff     |   approved

the result i'd show @ end :

status    | username pending   | ***aaa, ***bbbb cancelled | ***cccc, ***ddddd  approved  | ***eee, ***fff

i've tried select query

select distinct status,case when length(username) >=6 group_concat(replace(username, left( username, 3 ) , '***') separator ', ') else group_concat('***',username separator ', ') end username table group status

however, result of bbbbbbb query won't work because there 3 characters username @ first row. so, result become :

status    | username pending   | ***aaa, ***bbbbbbb       // wrong (it should ***aaa , ***bbbb) cancelled | ***cccc, ***ddddd // true approved  | ***eee, ***fff   // true

how perform query show result expected?. thank before

as understand, need move case inside group_concat. this:

select distinct status,   group_concat(     case       when length(username) >= 6 replace(username, left(username, 3), '***')       else concat('***', username)     end separator ', '   )as username table group status

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