PostgreSQL如何添加WHERE在哪里是count（）和GROUP

Question

如何在查询中添加WHERE函数？

SELECT count(*), date_trunc('year', "createdAt") AS txn_year 
FROM tables
WHERE active = 1  // not working I don't know why 
GROUP BY txn_year;

感谢您的任何意见

Answer 1

SELECT count(*), date_trunc('year', "createdAt") AS txn_year 
FROM tables 
WHERE column_active = 1
GROUP BY txn_year;

Answer 2

active的类型为character varying，即字符串类型。这应该有效：

SELECT count(*), date_trunc('year', "createdAt") AS txn_year 
FROM tables
WHERE active = '1'
GROUP BY txn_year;