Sql 博士后：Don'；如果当前时间在范围内，则不运行查询

我有一个查询，需要每小时运行一次，以便在查询返回任何数据时发送警报。为了避免在下班时间收到更改，如果当前时间在东部时间上午12点到上午7点之间，我不希望运行此查询

以下是SQL在其当前状态下的外观：

SELECT * FROM (
    SELECT FLOOR(EXTRACT(EPOCH FROM (now() - updated_at))/60) :: INT as minutes_since_update
    FROM table_a
        WHERE column_a IS TRUE AND column_b IS NULL
    LIMIT 1) a
WHERE minutes_since_update > 60

如何更改此查询，使其不会在非工作时间运行

我试过这个，但我不清楚为什么它不起作用

SELECT * FROM (
    IF (SELECT CURRENT_TIME BETWEEN '04:00:00' AND '11:00:00') THEN
        SELECT 0 as minutes_since_update FROM table_a where true = false;
    ELSE
        SELECT FLOOR(EXTRACT(EPOCH FROM (now() - updated_at))/60) :: INT as minutes_since_update
        FROM table_a
            WHERE column_a IS TRUE AND column_b IS NULL
        LIMIT 1;
    END IF;
) a
WHERE minutes_since_update > 60

---

只要把这个子句放在WHERE条件下就行了

SELECT FLOOR(EXTRACT(EPOCH FROM (now() - updated_at))/60) :: INT as minutes_since_update
FROM table_a
WHERE column_a IS TRUE AND column_b IS NULL
AND CURRENT_TIME BETWEEN '00:00:00' AND '07:00:00'
LIMIT 1;

---

但是，我可能会使用类似于

的东西，只是将子句置于WHERE条件中

SELECT FLOOR(EXTRACT(EPOCH FROM (now() - updated_at))/60) :: INT as minutes_since_update
FROM table_a
WHERE column_a IS TRUE AND column_b IS NULL
AND CURRENT_TIME BETWEEN '00:00:00' AND '07:00:00'
LIMIT 1;

---

但是，我可能会使用类似于

的内容，为什么不将其添加到WHERE子句？为什么不将其添加到WHERE子句？