begin if 1>=0 then dbms_output.put_line('1>=0'); else dbms_output.put_line('1<0'); end if; end; begin if 1>=0 then dbms_output.put_line('1>=0'); else dbms_output.put_line('1<0'); end if; end; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 1.3 ...
PostgreSQL offers several decision-making statements such asIF,IF-THEN-ELSE,IF-THEN-ELSIF, etc. All these decision-driven statements are used to control the flow of the SQL statements based on specific criteria. In Postgres, theIFandIF-THEN-ELSEstatements evaluate only one condition; however, the...
在PostgreSQL中,我们可以使用IF语句来根据条件执行不同的代码块。IF语句具有三个条件,分别是IF、ELSIF和ELSE。下面是对这三个条件的详细说明: 1. IF条件:IF语句的第一个条件...
问带有IF ELSE语句的postgresql plpsql函数EN条件语句，是程序中根据条件是否成立进行选择执行的一类语句，...
PostgreSQL IF Statement 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. ...
PL/pgSQL 中的 IF ELSE (适用于PostgreSQL) 在PostgreSQL中,你可以使用PL/pgSQL编写存储过程和触发器,其中包含 `IF ELSE` 结构。 **语法**: ```plpgsql DO $$ BEGIN IF condition THEN -- Statements to execute if condition is TRUE ELSIF another_condition THEN -- Statements to execute if another_...
The if...then...else statement executes the statements in the if branch if the condition evaluates to true; otherwise, it executes the statements in the else branch. Here’s the syntax of the if...then...else statement: if condition then statements; else alternative-statements; end if; ...
The CASE statement uses IF-THEN-ELSE logic within a single statement. It facilitates conditional inquiries by doing the work of an IF-THEN-ELSE statement and applying it to many possible conditions. Syntax CASE condition WHEN condition value THEN statement ELSE additional stateme...
IFconditionstatement(s)ELSEIFconditionstatement(s)ELSEIFconditionstatement(s)...ELSEstatement(s)ENDIF...
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...