mysql的if用法解决同一张数据表里面两个字段是否相等统计数据量。

 1 SELECT
 2     s.source_code,
 3     sum( s.actual_count ) AS act_count,
 4     count( s.exp_batch ) AS incorrect_batch,
 5     sum( IF ( s.actual_count = s.reconciliation_count, 1, 0 ) ) AS correct_batch 
 6 FROM
 7     db_data_reconciliation s 
 8 WHERE
 9     s.cd_time > '2019-03-18' 
10 GROUP BY
11     s.source_code