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mysql_and

工作记录_mysql_AND优先级高于OR优先级

## 1.错误示例 ```sql SELECT t.task_department_name, COUNT(*) total_count, SUM(CASE WHEN status='done' THEN 1 ELSE 0 END) AS finish_count, SUM(CASE WHEN st ......
优先级 mysql_AND mysql AND
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