SQL新手,我刚刚创建了一个带有关联的SQL查询: SELECT CASE WHEN exists (SELECT CLIENT_CODE FROM STG_DM_CLIENT WHERE CLIENT_CODE NOT IN (SELECT CLIENT_CODE FROM DM_CLIENT)) THEN 'A' else WHEN exists (SELECT STG.CLIENT_CODE AS TRAN_TYPE FROM STG_DM_CLIENT STG 浏览0提问于2011-09-29得票...
in SQL The CASE WHEN expression is quite often used with the SUM() function for more complex reporting. How does it work? The CASE expression assigns values according to the specified conditions and then the SUM function sums all those values. ...
The SQL CASE Expression TheCASEexpression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in theELSE...
#对电影的累计票房使用CASE WHEN分组 sql.sqldf("""select 电影名称,电影导演,电影主演,累计票房, cas...
WITH Data (value) AS ( SELECT 0 UNION ALL SELECT 1 ) SELECT CASE WHEN MIN(value) <= 0 THEN 0 WHEN MAX(1/value) >= 100 THEN 1 END FROM Data ; You should only depend on order of evaluation of the WHEN conditions for scalar expressions (including non-correlated sub-queries that retu...
在Pandas 中,case_when() 方法通常与 apply() 方法结合使用,以便根据条件对每一行数据进行操作。它提供了一种更灵活的方式来处理数据,而不需要编写大量的条件判断语句。 case_when() 方法的语法 case_when() 方法的语法如下: pandas.Series.case_when(conditions, values, default=None, *args, **kwargs) ...
CASE is a Control Flow statement that acts a lot like an IF-THEN-ELSE statement to choose a value based on the data. The CASE statement goes through conditions and returns a value when the first condition is met. So, once a condition is true, it will short circuit, thereby ignoring lat...
Transact-SQL reference for the CASE expression. CASE evaluates a list of conditions to return specific results.
CASE expression syntax is similar to an IF-THEN-ELSE statement. Oracle checks each condition starting from the first condition (left to right). When a particular condition is satisfied (WHEN part) the expression returns the tagged value (THEN part). If none of the conditions are matched, the...
SQL Copy WITH Data (value) AS ( SELECT 0 UNION ALL SELECT 1 ) SELECT CASE WHEN MIN(value) <= 0 THEN 0 WHEN MAX(1 / value) >= 100 THEN 1 END FROM Data; GO You should only depend on order of evaluation of the WHEN conditions for scalar expressions (including non-correlated sub...