从不同的表中选择两列之间的MIN和MAX日期

Question

我有expenseDate(表A)和invoicedate(表B).这些表之间没有关系.

我需要在expenseDate和invoiceDate之间获得MIN和MAX日期.

由于我不熟悉后端,有人可以帮忙吗？谢谢.

Answer 1

SELECT MIN(mydate) mindate, MAX(mydate) maxdate
FROM(
SELECT expenseDate AS mydate
FROM tableA
UNION ALL
SELECT invoicedate AS mydate
FROM tableB
) AS table