在MySQL SELECT中使用IF/ELSE 、 我有一张members表和一张venues表。我目前有这个select语句:FROM Venue ORDER BY VenueName 此语句的结果用于使用场所名称填充下拉列表我称它为"NEW SELECT“。我有两个超级管理员,他们的members.venueid是all而不是场所id号,所以我想创建一个语句来运行新的SELECT else if 浏览1...
下面是查询:( ELSE IF t1.insuringPhoneIS NOT NULL THEN t1.insuringPhone ELSE IF t1.person_id IS NOT NULL THEN (SELECT person_contact.value 浏览8提问于2020-06-05得票数 0 1回答 MYSQL中的流量控制 我试图将Server查询转换为MYSQL,但是IF语句有问题。在Server版本中,它们用于根据标志引导查询流,但我...
IF new.nickname <> old.nickname THEN SET v_nickname = new.nickname; ELSE SET v_nickname = old.nickname; END IF; IF USER() LIKE 'lily%' OR USER() LIKE 'lucy%' OR USER() LIKE 'simon%' THEN INSERT INTO t1_log_normal VALUES (old.id,v_rank,v_nickname,NOW(),USER()); END IF;...
SELECT COUNT(*) INTO count FROM employees WHERE gender = 'Male'; ELSEIF in_gender = 'Female' THEN SELECT COUNT(*) INTO count FROM employees WHERE gender = 'Female'; ELSE SET count = -1; END IF; END // DELIMITER ; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. ...
ELSE SELECT 'if else ...'; END IF; END; # 调用存储过程 CALL PROC_IF1() ; # IF语句的基本使用 CREATE PROCEDURE PROC_IF2(IN age int) BEGIN #DECLARE AGE INT(3) DEFAULT 12; IF AGE < 18 THEN SELECT '未成年'; ELSEIF AGE BETWEEN 18 AND 30 THEN SELECT '青年人'; ...
MariaDB [test]>CREATETABLEIFNOTEXISTSseries # 创建series表(前提是series表不存在,如果已经存在,则不创建)->(idINTNOTNULLPRIMARYKEY AUTO_INCREMENT); Query OK,0rowsaffected (0.005sec) # 接下来我们再来看看表是否添加成功 MariaDB [test]>showtables;+---+|Tables_in_test|+---+|authors||books||se...
SELECT * FROM employees ORDER BY ASC; 案例2:查询部门编号>=90的员工信息,按入职时间先后进行排序 SELECT * employees WHERE department_id>=90 ORDER BY hiredate ASC; 案例3:按年薪的高低显示员工的信息和年薪【按表达式排序】 SELECT *,salary*12*(1+IFNULL(commission_pct,0)) 年薪 FROM employees OREDE...
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#一、CASE WHEN、IF、IFNULL条件函数 #1、CASE WHEN(简单函数):CASE 字段 WHEN 预期值 THEN 结果1 ELSE 结果2 END ①、场景:在score表中,sex为1表示男性,sex=0表示女性,查询时转换成汉字显示 SELECT name,(CASE sex WHEN 0 THEN '女' ELSE '男' END) sex FROM score #2、CASE WHEN(条件表达式):CASE...