The simpleCASEstatement has the following structure: CASEselectorWHENselector_value_1THENstatements_1WHENselector_value_1THENstatement_2 ...ELSEelse_statementsENDCASE;Code language:PostgreSQL SQL dialect and PL/pgSQL(pgsql) Let’s examine the syntax of the simpleCASEstatement in detail: ...
这些文字都具有类型'unknown'，让ELSE来确定CASE的返回类型。但是文字不能被解释为那种类型。
这些文字都具有类型'unknown'，让ELSE来确定CASE的返回类型。但是文字不能被解释为那种类型。
Whether you need to do basic comparisons or more intricate logical processes, the PostgreSQL CASE statement is the right tool. How To Use CASE in PostgreSQL Let’s look at the general syntax of PostgreSQL CASE and its basic usage: Copy 1 CASE 2 WHEN condition1 THEN result1 3 WHEN condition...
在PostgreSQL中,CASE语句是一种条件表达式,用于根据条件返回不同的值。在使用CASE语句时,可以使用SUM聚合函数来对满足条件的值进行求和。 当CASE语句中的SUM聚合函数返回false时,表示没有满足条件的值,因此返回的结果为0。 下面是一个示例: 代码语言:sql
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Explore Python'smatch-casestatement, introduced in Python 3.10, and learn how structural pattern matching brings a new level of elegance and power to Python programming. We'll delve into its syntax, applications in data science and machine learning, and even how it compares to traditional switch-...
Basic Syntax The CASE statement comes in two flavors: the first evaluates one or more conditions and returns the result for the first condition that is true. If no condition is true, the result after ELSE is returned, or NULL if there is no ELSE part: ...
`SELECT CASE` 语句(在某些编程语言中也称为 `switch` 语句)是一种条件控制结构,用于根据变量的值执行不同的代码块。标签(也称为 `case` 子句)的顺序在某些情况下确实很重要。...
Adding aCASE STATEMENTpipeline step allows us to set the conditions for theWHENand theELSEjust like we did before, without having to type in the entire SQL syntax. Then after hiding the original ‘Provider’ column and using aREORDER COLUMNSstep and aPIVOT DATAstep we’ll get the same table...