As stated earlier, the CASE statement is a conditional expression, so it can be used with any statement or clause where an expression can be used, such as a WHERE clause, SELECT statement, etc. Postgres supports two forms of the CASE statement: A Searched CASE and a Simple CASE. Basic S...
EN直接上代码了 // switch case case语句测试.cpp : 定义控制台应用程序的入口点。 // #include "...
CREATE OR REPLACE function func(age bigint) RETURNS TABLE(years int, category text) AS $$ SELECT CASE WHEN age > 30 THEN SELECT CASE WHEN (age >= 60) THEN 0 WHEN (age >= 50) THEN 10 WHEN (age >= 40) THEN 20 ELSE 30 END, CASE WHEN (age >= 60) THEN "BABY BOOMER" WHEN (...
我正在尝试执行select语句,具体取决于大小写 SELECT CASE WHEN TO_CHAR(today, "%a") = 'Mon' ELSE (SELECT COUNT(*) FROM jobs WHERE datein = today) END CASE; 因此,我期望如果日期是'Mon 浏览22提问于2019-12-11得票数 0 回答已采纳 1回答 基于Postgresql结果的Case语句 、 (Case WHEN LENGTH(inpu...
Besides the WHERE clause, you can use other clauses in the SELECT statement for the SELECT INTO statement such as INNER JOIN, LEFT JOIN, GROUP BY, and HAVING. Note that you cannot use the SELECT INTO statement in PL/pgSQL because it interprets the INTO clause differently. In this case,...
CASE 语句 除了IF 语句之外,PostgreSQL 还提供了 CASE 语句,同样可以根据不同的条件执行不同的分支语句。CASE 语句分为两种:简单 CASE 和搜索 CASE 语句。 ⚠️CASE 语句和第 15 篇中介绍的 CASE 表达式不是一个概念,CASE 表达式是一个 SQL 表达式。 简单CASE 语句的结构如下: CASE search-expression WHEN ...
Keep in mind that, the column must be present in the SELECT statement of your query, on which you are specifying the boolean expressions (in CASE). But when you are using CASE in pair with a where clause, you need not to follow this (more on this later). The data-type of the ...
对于postgresql中的部分系统表,有个唯一表示Row identifier 行标识符,(hidden attribute; must be explicitly selected),是一个隐藏的字段,只有显示调用才能显示,比如select oid,* from pg_class tips 3 postgresql中case when 语法和sql 差不多。 SELECT
设置方法:菜单Tools --> Preferences --> Editor --> Keyword Case --> Uppercase 4.自动替换 快捷输入SQL语句,例如输入s,按下空格,自动替换成SELECT;再例如,输入sf,按下空格,自动替换成SELECT * FROM,非常方便,节省了大量的时间去编写重复的SQL语句。
SELECT 允许从表、视图、具体化视图或其他类似表的对象的任何列或特定列执行 SELECT 操作。 还允许使用 COPY TO。 UPDATE、DELETE 或 MERGE 也需要此权限。 对于SEQUENCE,此权限还允许使用 currval 函数。 对于LARGE OBJECT,此权限允许读取对象。 INSERT