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[英]Select counts from 2 different tables without subselect within subselect
[英]How to compare counts from subselect?
我想比較兩個表之間的計數。 或者說,output 如果表 1 的計數大於表 2 的計數:
SELECT c1 > c2 FROM
(SELECT count(*) from table1) as c1,
(SELECT count(*) from table2) as c2
(現實世界的選擇要復雜得多,但結構相同)
結果: Unknown column 'c1' in 'field list'
我如何才能真正評估計數?
為列命名:
SELECT c1.cnt > c2.cnt
FROM (SELECT count(*) as cnt from table1) c1 CROSS JOIN
(SELECT count(*) as cnt from table2) c2
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