PostgreSQL does not have a direct IF statement for use within SQL queries. However, conditional logic can be achieved using: 1. PL/pgSQL Blocks: The IF statement is available in PL/pgSQL blocks for procedural logic. 2. CASE Expression: For inline conditional logic in SQL queries. Using IF...
PostgreSQL provides some statements that assist users in decision-making scenarios. These statements take a decision based on some specific criteria/condition and are hence referred to as control statements. In Postgres, theif-statementis one of the most valuable and frequently used control statements....
case when boolean_expression then statement; when boolean_expression then statement; ... end case; case when boolean_expression then statement; when boolean_expression then statement; ... end case; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 对上面的例子进行改进: declare c_num number...
azurerm_postgresql_server.region[0].name : var.postgresqlServerName } 不幸的是,Terraform似乎想要计算元组(region[0]),尽管并不是在每个场景中都必须这样做: Error: Invalid index on terraform/region/03-database.tf line 34, in locals: 34: database_se ...
This tutorial works for PostgreSQL anywhere. Postgres on Neon provisions in 1 second. Get the free plan here. Summary: in this tutorial, you will learn how to use the PL/pgSQL if statements to execute a command based on a specific condition. Introduction to PL/pgSQL IF Statement The if...
postgresql if-statement plpgsql 这是我代码的相关部分(请注意,ignoredwp是一个布尔函数参数): where cp.imei in (select distinct IMEI from imei_clustered) and cp."generatedAt"::date between cs."campaignStartDate" and cs."campaignEndDate" IF ignoredwp=true THEN AND NOT EXISTS ( SELECT 1 FROM ...
postgresql if动态sql plsql执行动态sql 在Oracle数据库开发PL/SQL块中我们使用的SQL分为:静态SQL语句和动态SQL语句。所谓静态SQL指在PL/SQL块中使用的SQL语句在编译时是明确的,执行的是确定对象。而动态SQL是指在PL/SQL块编译时SQL语句是不确定的,如根据用户输入的参数的不同而执行不同的操作。编译程序对动态...
IF condition THEN statement;ENDIF; The IF condition runs when a condition is evaluated as true. If the condition is false then it goes to the next statement after END IF. Example DO$$DECLARExinteger:=10;y integer := 20;BEGINIFx > yTHENRAISE NOTICE'x is greater tha...
Postgresql-仅执行某些IF语句 我想通过使用UNION将一些查询的结果放在一起。但我只想执行一些查询。。。在下面的示例中,('Daily','Yearly')部分将自动填写。 大致如下: (if 'Daily' in ('Daily','Yearly') then my first query goes here... end if)...
问如何在Postgresql中使用逻辑运算符实现多个if子句EN我有3张桌子，我必须根据下面的情况检查某些记录的...