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SELECT COUNT(DISTINCT `wr_parent`) AS `cnt` FROM g5_write_DONG WHERE ((INSTR(wr_subject7C7Cwr_content, '160907')) ) and (wr_num between -174994 and (-174994 + 10000))

1054 : Unknown column 'wr_subject7C7Cwr_content' in 'where clause'

error file : /bbs/board.php