我运行了两个看起来做同样事情的查询,但结果不同:
SELECT COUNT(stage1) AS total
FROM progress_status
WHERE stage1 = 3
AND stage2 != 3 AND stage3 !=3 AND stage4 !=3 AND stage5 !=3;
# total = 90
SELECT COUNT(stage1) AS total
FROM progress_status
WHERE stage1 = 3
AND (stage2,stage3,stage4,stage5) != (3,3,3,3)
# total = 314