比x行更

Question

我可以很容易地通過下面的查詢找到形式_%_jobs的所有表查找所有表的名稱：

select * from pg_tables where tablename like '_%_jobs' 

我想過濾該列表，從而爲僅僅是表有超過200,000行。

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我曾嘗試：

select * from pg_tables where tablename like '_%_jobs' having count(*) > 200000 

但這會導致一個錯誤：

ERROR: column "pg_tables.schemaname" must appear in the GROUP BY clause or be used in an aggregate function

我怎樣才能做到這一點？

Answer 1

嘗試

SELECT relname, reltuples from pg_class where relname like '_%_jobs' 

這裏和實際報告的數字之間有可能略有差異。從手動節上reltuples：

Number of rows in the table. This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.