原始sql 執行半小時, 臨時表gl_tmp1裏大概2萬條數據
select distinct ( gl_detail.pk_voucher ) from gl_detail , gl_contrast where gl_detail.pk_detail = gl_contrast.fk_detail and gl_detail.pk_voucher in ( select pk from gl_tmp1 )
優化後sql
select distinct ( gl_detail.pk_voucher ) from gl_detail , gl_contrast , gl_tmp1 where gl_detail.pk_detail = gl_contrast.fk_detail and gl_detail.pk_voucher = gl_tmp1.pk