我們如何從 MySQL 表中取得一列或多列作為輸出？

SELECT 指令可用來從 MySQL 表中取得一列或多列作為輸出。下面給了一個

範例來取得一列或多列

mysql> Select * from Student;

+------+---------+---------+-----------+
| Id   | Name    | Address | Subject   |
+------+---------+---------+-----------+
| 1    | Gaurav  | Delhi   | Computers |
| 2    | Aarav   | Mumbai  | History   |
| 15   | Harshit | Delhi   | Commerce  |
| 17   | Raman   | Shimla  | Computers |
+------+---------+---------+-----------+

4 rows in set (0.01 sec)

mysql> Select Name,Subject from Student;

+---------+-----------+
| Name    | Subject   |
+---------+-----------+
| Gaurav  | Computers |
| Aarav   | History   |
| Harshit | Commerce  |
| Raman   | Computers |
+---------+-----------+

4 rows in set (0.00 sec)

上面的查詢從「學生」表中取得兩列「姓名」和「主題」。

mysql> Select Address from Student;

+---------+
| Address |
+---------+
| Delhi   |
| Mumbai  |
| Delhi   |
| Shimla  |
+---------+

4 rows in set (0.00 sec)

上面的查詢僅從「學生」表中取得一列「地址」。

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