我們如何透過從基底表中基於模式匹配選擇資料來建立MySQL視圖？

MySQL LIKE 運算子用於根據模式匹配選擇資料。同樣，我們可以將 LIKE 運算子與視圖結合使用，根據基底表中的模式匹配來選擇特定資料。為了理解這個概念，我們使用具有以下資料的基底表「student_info」 -

mysql> Select * from Student_info;
+------+---------+------------+------------+
| id   | Name    | Address    | Subject    |
+------+---------+------------+------------+
| 101  | YashPal | Amritsar   | History    |
| 105  | Gaurav  | Chandigarh | Literature |
| 125  | Raman   | Shimla     | Computers  |
| 130  | Ram     | Jhansi     | Computers  |
| 132  | Shyam   | Chandigarh | Economics  |
| 133  | Mohan   | Delhi      | Computers  |
+------+---------+------------+------------+
6 rows in set (0.00 sec)

範例

以下查詢將建立一個名為「Info」的視圖，使用「LIKE」運算符根據模式匹配選擇一些特定值-

mysql> Create or Replace view Info AS SELECT * from student_info WHERE Name LIKE '%Ra%';
Query OK, 0 rows affected (0.11 sec)

mysql> Select * from Info;
+------+--------+------------+------------+
| id   | Name   | Address    | Subject    |
+------+--------+------------+------------+
| 105  | Gaurav | Chandigarh | Literature |
| 125  | Raman  | Shimla     | Computers  |
| 130  | Ram    | Jhansi     |  Computers |
+------+--------+------------+------------+
3 rows in set (0.00 sec)

我們也可以將NOT 與LIKE 運算子一起使用，如下-

mysql> Create or Replace view Info AS SELECT * from student_info WHERE Name NOT LIKE'%Ra%';
Query OK, 0 rows affected (0.14 sec)

mysql> Select * from info;
+------+---------+------------+-----------+
| id   | Name    | Address    | Subject   |
+------+---------+------------+-----------+
| 101  | YashPal | Amritsar   | History   |
| 132  | Shyam   | Chandigarh | Economics |
| 133  | Mohan   | Delhi      | Computers |
+------+---------+------------+-----------+
3 rows in set (0.00 sec)

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