1. select的配合用法 1Examples:2MariaDB> SELECT CASE 1 WHEN 1 THEN 'one'3-> WHEN 2 THEN 'two' ELSE 'more'END;4-> 'one'5MariaDB> SELECT CASE WHEN 1>0 THEN 'true' ELSE 'false'END;6-> 'true'7MariaDB> SELECT CASE BINARY 'B'8-> WHEN 'a' THEN 1 WHEN 'b' THEN 2END;9->...
Hi, I am trying to get data from a table to a datapage calculated field based on conditions that are chosen in the data page.. I get to work without any CASE & WHEN conditions i.e. if I only have to SELECT from one column, but that only takes me halfway.
A. 使用带有 CASE 简单表达式的 SELECT 语句 Using a SELECT statement with a simple CASE expression 在SELECT 语句中,CASE 简单表达式只能用于等同性检查,而不进行其他比较。 下面的示例使用 CASE 表达式更改产品系列类别的显示,以使这些类别更易于理解。 USE AdventureWorks2012; GO SELECT ProductNumber, Category ...
[ WITH with_query [, ...] ] SELECT [ ALL | DISTINCT ] select_expr [, ...] [ FROM from_item [, ...] ] [ WHERE condition ] [ GROUP BY [ ALL | DISTINCT ] grouping_element [, ...] ] [ HAVING condition] [ WINDOW window_name AS ( window_definition ) [, ...] ] [ { ...
SELECTcolumn1, column2, ...CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededENDASalias_nameFROMtable_name; We can add as manyWHEN ... THENconditions as required in theCASEstatement. For example, ...
NOTE: SQL commands are not case sensitive. The above SELECT statement can also be written as"select first_name from students_details;" You can also retrieve data from more than one column. For example, to select first name and last name of all the students. ...
The simple CASE statement has the following structure: CASE selector WHEN selector_value_1 THEN statements_1 WHEN selector_value_1 THEN statement_2 ... ELSE else_statements END CASE; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Let’s examine the syntax of the simple CASE ...
SQL中的 CASE 类似编程语言里的 if-then-else 语句,用做逻辑判断。可以用于SELECT语句中,也可以用在WHERE,GROUP BY 和 ORDER BY 子句;可以单独使用,也可以和聚合函数结合使用。 语法如下: CASE WHEN conditi…
简单Case函数和Case搜索函数。 –简单Case函数 CASE sex WHEN ‘1’ THEN ‘男’ WHEN ‘2’ THEN ...
Java Statement 执行插入sql的返回结果 java执行select Java SE基础(三)流程控制 概述 顺序结构 选择结构 if-else语句 switch-case语句 循环结构 for语句 while语句 do-while语句 注意 死循环与跳转控制语句 概述 流程控制就是使用流程控制语句来控制程序的执行流程。Java程序的执行流程分为:顺序结构、选择结构、循环...