MySQL查詢從多個select語句中取得結果？

要從多個 select 語句中取得結果，請使用 UNION ALL。以下是語法 -

select yourValue1 AS anyColumnName
UNION ALL
select yourValue2 AS yourColumnName
.
.
.
.
N

讓我們實作上述語法，以傳回不同行中的數字枚舉 -

mysql> select 100 AS Number
   UNION ALL
   select 1000 AS Number
   UNION ALL
   select 10000 AS Number
   UNION ALL
   select 100000 AS Number
   UNION ALL
   select 1000000 AS Number
   UNION ALL
   select 10000000 AS Number
   UNION ALL
   select 100000000 AS Number
   UNION ALL
   select 1000000000 AS Number;

這將產生以下輸出 -

+------------+
| Number     |
+------------+
|        100 |
|       1000 |
|      10000 |
|     100000 |
|    1000000 |
|   10000000 |
|  100000000 |
| 1000000000 |
+------------+
8 rows in set (0.00 sec)

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