SQL 条件语句 (IF, CASE WHEN, IFNULL) 1、IF 1.1 表达式: IF( expr1 , expr2 , expr3 ) expr1条件,条件为true,则值是expr2 ,false,值就是expr3 示例; SELECT o.id,u.account,catagory
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然后进行一系列的判断,给变量赋值,我们完全可以在sql语句中使用case when语句来进来判断; 从而提高程序可读性和性能。 这段sql会进行判断每行数据的State字段。最后查询结果会多一个State1字段,State1字段的值就在case when判断里赋值的, 这样程序上再获取到一个数据源之后,就直接取出State1字段值,就完全了上述代码...
只可以用在pl/sql中,不能用在SQL中,结束标志是END CASE!Case Statement 相当于一组IF…THEN…ELSE…END IF语句,不需要返回值,只是在条件匹配的时候执行某种操作而已,所以在每个WHEN…THEN之后需要有一个分号,表示一条执行语句! CASE {variable or expression} WHEN {value} THEN {one or more operations};[WHE...
CASE WHEN 语句的使用方法如下: 1. 简单的条件判断: ``` SELECT column_name, oracle case when用法sql oracle case when 用法 sql OracleCaseWhen 用法 SQL 是一种极其重要且多用的语句,它可 以运用于执行复杂逻辑功能,涉及到数据查询、转换以及分类等工作。 在 Oracle 数据库中,Case When 语句提供了一种方...
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 value mentioned in ...
oracle.javatools.db.sql Contains an API for declaratively parsing SQL queries (SELECT statements). Uses ofCaseStatement.WhenTheninoracle.javatools.db.sql Methods inoracle.javatools.db.sqlthat returnCaseStatement.WhenThen Modifier and TypeMethod and Description ...
Oracle's Guide to Preventing NULL Values in to_date Function Question: I possess a working select statement with a where clause containing a statement similar to this... """. The start date of the camp, when converted to the format 'MM/DD/YYYY', should be greater than or ...
CASE WHEN condition_1 THEN statements_1 WHEN condition_2 THEN statements_2 ... WHEN condition_n THEN statements_n [ ELSE else_statements ] END CASE;] Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) The searched CASE statement follows the rules below: The conditions in the WHEN...
FromOracle Database 23ai, theautomatic SQL transpilercan extract SQL expressions in PL/SQL. These are then part of the SQL statement, so at runtime it's as-if the function doesn't exist! To do this, ensure thesql_transpilerparameter ison(it'soffby default). When a function in thewhere...