如何在 WHERE 子句中用动态日期替换固定日期？
How to replace a fixed date with dynamic date in WHERE clause?
select concat(CURRENT_DATE, ' ', '00:00:00+02:00')
returns "2020-07-14 00:00:00+02:00"
我可以将此结果复制粘贴到我的 WHERE 子句中：
where (xyz between timestamp with time zone '2020-06-01 00:00:00+02:00'
and timestamp with time ZONE 2020-07-14 00:00:00+02:00
它有效，但如果我使用更动态的构造 concat(CURRENT_DATE, ' ', '00:00:00+02:00') 代替：
where (xyz between timestamp with time zone '2020-06-01 00:00:00+02:00'
and timestamp with time ZONE concat(CURRENT_DATE, ' ', '00:00:00+02:00')
我收到一个语法错误：
ERROR: syntax error at or near "concat" LINE 57: ...6-01 00:00:00+02:00' and timestamp with time ZONE concat(CUR...
为什么第一个 WHERE 子句有效，但另一个无效，即使它以相同的格式打印相同的日期？
您可以使用 at time zone:
where xyz between ('2020-06-01'::date at time zone '+02:00') and (current_date at time zone '+02:00')
select concat(CURRENT_DATE, ' ', '00:00:00+02:00')
returns "2020-07-14 00:00:00+02:00"
我可以将此结果复制粘贴到我的 WHERE 子句中：
where (xyz between timestamp with time zone '2020-06-01 00:00:00+02:00'
and timestamp with time ZONE 2020-07-14 00:00:00+02:00
它有效，但如果我使用更动态的构造 concat(CURRENT_DATE, ' ', '00:00:00+02:00') 代替：
where (xyz between timestamp with time zone '2020-06-01 00:00:00+02:00'
and timestamp with time ZONE concat(CURRENT_DATE, ' ', '00:00:00+02:00')
我收到一个语法错误：
ERROR: syntax error at or near "concat" LINE 57: ...6-01 00:00:00+02:00' and timestamp with time ZONE concat(CUR...
为什么第一个 WHERE 子句有效，但另一个无效，即使它以相同的格式打印相同的日期？
您可以使用 at time zone:
where xyz between ('2020-06-01'::date at time zone '+02:00') and (current_date at time zone '+02:00')