left join on the id and if "OUT" is yes. Then your just assigning IN to the first table (from table) and the second table (left join table) to OUTWhy don't you try the case statement?You can accomplish this by joining the relevant information from the table unto itself using INNER JOIN.
Mysql中的条件语句if、case Mysql中的条件语句在我们对数据进行转换的时候比较有用,这样就不需要创建中转表。...= "" IF ELSE 流程控制语句 在mysql存储过程中的用法: IF search_condition THEN statement_list [ELSEIF search_condition...[ELSE statement_list] END IF IF作为一条语句,在END IF后需要加上分...
The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause. It can be used in the Insert statement as well. In this article, we would explore the CASE statement and its various use...
一、 IF-THEN语句 IF CONDITION THEN STATEMENT 1; ... STATEMENT N; END IF; 二、 IF-THEN-ELSE语句 IF CONDITION THEN STATEMENT 1; ELSE STATEMENT 2; END IF; 三、 ELSLF语句 IF CONDITION 1 THEN STATEMENT 1; ELSIF CONDITION 2 THEN STATEMENT 2; ELSIF CONDITION 3 THEN STATEMENT 3; ... ELS...
SELECT CASE WHEN age < 18 THEN '未成年' WHEN age >= 18 AND age < 60 THEN '成年' ELSE '老年' END AS age_group, COUNT(*) AS count FROM users GROUP BY age_group 在这个示例中,我们根据用户的年龄来选择不同的年龄段,并统计每个年龄段的用户数量。我们使用CASE语句来实现这个功能,其中包含了...
{ sql_statement | statement_block }使用语句块定义的任何有效的Transact-SQL语句或语句分组。要定义语句块(批处理),请使用流语言关键字BEGIN和END 组合。尽管所有Transact-SQL语句在BEGIN…END块中都是有效的,但某些Transact-SQL语句不应在同一批(语句块)中组合在一起。 示例1: 1 2 3 4 IF DATENAME(weekday...
CASE 语句在指定的搜索条件为 true 时执行一条或多条语句。 CASE 是独立的语句,它与必须作为表达式组成部分出现的 CASE 表达式不同。 CASE 语句有两种形式:简单 CASE 语句和搜索型 CASE 语句。 简单CASE 语句 (PL/SQL) 简单CASE 语句尝试将表达式 (称为选择器) 与一个或多个 WHEN 子句中指定的另一个表达式...
if/then else case statement query in SQL ServerThis creates start and end columns by doing a ...
Because we defined the Staff column in the subquery, we can refer to it in the outer query. This makes re-using code much easier and it makes the SQL statement more compact and easier to maintain. If we would like to change the definition of Staff, we would need to alter it at only...
[ELSE statement_list] END CASE;案例根据传入的月份,判定月份所属的季节(要求采用case结构)。1-3月份,为第一季度 4-6月份,为第二季度 7-9月份,为第三季度 10-12月份,为第四季度create procedure p(in month int) begin declare result varchar(10); case when month >= 1 and month <= 3 then set...