CASE表达式是用来判断条件的,条件成立时返回某个值,条件不成立时返回另一个值。 语法: CASEWHENComparsionConditionTHENresultWHENComparsionConditionTHENresultELSEotherEND (注:各分支返回的数据类型需一致。) (注:when子句一定要有排他性,因为当when子句为真时,剩余的when子句会被忽略。) CASE表达式的用途: 1,转换...
b.STATUS, a.PAYMENTS_PENDING,CASEWHENc.PPAPPLSTRAT='Y'ANDa.PAYMENTS_PENDING='Y'ANDc.DAPPLSTRAT='Y'AND(b.PROBLEM_IDISNOTNULLANDb.STATUS<>'C')THEN'Y'WHENc.PPAPPLSTRAT='Y'ANDa.PAYMENTS_PENDING='Y'ANDc.CAPPLSTRAT='Y'AND(b.PROBLEM_IDISNULLOR(b.PROBLEM_IDISNOTNULLANDb.STATUS='C')...
---+---+ 如上所示, 你需要通过使用 Variables 表 来找到 Expressions 表中的每一个布尔表达式的值...解题 # Write your MySQL query statement below select left_operand, operator, right_operand, case...when (l-r>0 and operator='>') or(l=r and operator='=') or(l-r<0 and 59630 SQL中...
The only downside of temporary tables is that the query optimizer in the database cannot optimize the query. When performance is needed I rewrite the queries defined with temporary tables to a query defined with WITH statement. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 WITHhelper_table1...
SELECTorder_id, customer_id,CASEWHENamount >=400THEN(amount - amount *10/100)ENDASoffer_priceFROMOrders; Run Code Here, theCASEstatement checks if theamountis greater than or equal to400. If this condition is satisfied, a new columnoffer_pricewill contain the values equal toamount - amount...
when 条件1 then 结果1或者语句1(语句需要加分号) when 条件2 then 结果2或者语句2 ... else 条件或者语句 end [case]; 这种写法和第一种类似,没太大改变 if 结构:只能使用在begin end之间 if 结构类似于java中的if ...else if...else 语法: if...
# Write your MySQL query statement below #先把简单的偶数都-1;然后对于非最大的奇数id+1;最后(即else)如果存在未变化的数则值不变 #其实就是case when和逻辑的应用,比较简单 select case when id%2=0 then id-1 #取余判断奇偶 when id<(select max(id) from seat) then id+1 #注意聚合函数需要写...
报错:ERROR: Query:[xxx] Get result failed: canceling statement due to user request 问题原因:查询被取消,通常是因为表被执行了DROP或TRUNCATE操作。 解决方法:可以通过HoloWeb Query洞察排查是否有冲突的DDL,详情请参见Query洞察。后期尽量避免Query执行过程中有DDL冲突任务。
CASE ProductLine WHEN 'R' THEN 'Road' WHEN 'M' THEN 'Mountain' WHEN 'T' THEN 'Touring' WHEN 'S' THEN 'Other sale items' ELSE 'Not for sale' END, Name FROM Production.Product ORDER BY ProductNumber; GO Using a SELECT statement with a searched CASE expression ...
=0HAVING 和 WHERE 同时使用#Exampleofusinghavingandwhereinthesamequery#WriteyourMySQLquerystatement...