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法律如何在 MySQL CASE 語句中使用 OR 條件？
以下是 MySQL CASE OR 條件的語法
SELECT yourColumnName1,.....N , CASE WHEN yourColumnName2=0 or yourColumnName2IS NULL THEN 'yourMessage1' ELSE 'yourMessage2' END AS yourAliasName FROM yourTableName;
為了理解以上語法，我們建立一個表。建立表的查詢如下
mysql> create table ReservationSystems - > ( - > Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, - > Name varchar(20), - > isSeatConfirmed tinyint - > ); Query OK, 0 rows affected (0.61 sec)
使用 insert 命令向表中插入一些記錄
查詢如下
mysql> insert into ReservationSystems(Name,isSeatConfirmed) values('Larry',0);
Query OK, 1 row affected (0.12 sec)
mysql> insert into ReservationSystems(Name,isSeatConfirmed) values('Bob',1);
Query OK, 1 row affected (0.15 sec)
mysql> insert into ReservationSystems(Name,isSeatConfirmed) values('Mike',NULL);
Query OK, 1 row affected (0.14 sec)
mysql> insert into ReservationSystems(Name,isSeatConfirmed) values('David',1);
Query OK, 1 row affected (0.17 sec)
mysql> insert into ReservationSystems(Name,isSeatConfirmed) values('Carol',0);
Query OK, 1 row affected (0.19 sec)
mysql> insert into ReservationSystems(Name,isSeatConfirmed) values('James',1);
Query OK, 1 row affected (0.11 sec)使用 select 語句顯示錶中的所有記錄
查詢如下
mysql> select *from ReservationSystems;
輸出如下
+----+-------+-----------------+ | Id | Name | isSeatConfirmed | +----+-------+-----------------+ | 1 | Larry | 0 | | 2 | Bob | 1 | | 3 | Mike | NULL | | 4 | David | 1 | | 5 | Carol | 0 | | 6 | James | 1 | +----+-------+-----------------+ 6 rows in set (0.00 sec)
以下是在 MySQL CASE 中使用 OR 條件
mysql> select Name, - > CASE WHEN isSeatConfirmed=0 or isSeatConfirmed IS NULL THEN 'YOUR SEAT IS NOT CONFIRMED' - > ELSE 'YOUR SEAT IS CONFIRMED' - > END AS SEATCONFIRMSTATUS - > FROM ReservationSystems;
輸出如下
+-------+----------------------------+ | Name | SEATCONFIRMSTATUS | +-------+----------------------------+ | Larry | YOUR SEAT IS NOT CONFIRMED | | Bob | YOUR SEAT IS CONFIRMED | | Mike | YOUR SEAT IS NOT CONFIRMED | | David | YOUR SEAT IS CONFIRMED | | Carol | YOUR SEAT IS NOT CONFIRMED | | James | YOUR SEAT IS CONFIRMED | +-------+----------------------------+ 6 rows in set (0.00 sec)
更新於： 30-7-2019
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