在MySQL的UNION select查詢中選擇表名作爲列

Question

我希望能夠選擇行所來自的表的名稱作爲聯合選擇查詢中的列。這樣的事情：

SELECT [TABLENAME], text from table1 
UNION 
SELECT [TABLENAME], text from table2 
ORDER BY date 

有沒有人知道這是可能的？ 謝謝

Answer 1

您已經在查詢該表本身。例如： - Table 1和Table

所以你基本上可以輸出表名作爲字符串本身 -

SELECT 'table1' as tableName, text from table1 
UNION 
SELECT 'table2' as tableName, text from table2 
ORDER BY date 

Answer 2

因爲你已經有了反正鍵入表名到SQL，爲什麼不把它作爲選擇中的字符串呢？即

SELECT 'table1' as tablename, text from table1 
UNION 
SELECT 'table2' as tablename, text from table2 
ORDER BY date