sql - PostgreSQL - 为什么这个语句会导致语法错误？

Question

SELECT
        (SELECT COUNT(*) FROM table1) AS count1 WHERE date='2019-06-12',
        (SELECT COUNT(*) FROM table2) AS count2 WHERE date='2019-06-12'

为什么此语句会在“,”处或附近导致语法错误？

Answer 1

需要在子查询中添加where子句

SELECT
       (SELECT COUNT(*) FROM table1 WHERE date='2019-06-12') AS count1 ,
       (SELECT COUNT(*) FROM table2 WHERE date='2019-06-12') AS count2