如何获取UNION表名？

Question

CREATE TABLE t1 LIKE testTable
CREATE TABLE t2 LIKE testTable
CREATE TABLE t3 LIKE testTable

CREATE TABLE tableALL LIKE testTable;
ALTER TABLE tableALL ENGINE=MERGE UNION=(t1,t2,t3) INSERT_METHOD=LAST;

我可以使用SQL查询获得{1}} t1，t2和t3的联合吗？

Answer 1

您可以在合并时手动获取表格nemes：

SELECT *, 't1' AS tableName FROM t1
UNION ALL
SELECT *, 't2' AS tableName FROM t2
UNION ALL
SELECT *, 't3' AS tableName FROM t3