Summary: in this tutorial, you will learn how to use the PL/pgSQL select into statement to select data from the database and assign it to a variable. Introduction to PL/pgSQL Select Into statement The select into statement allows you to select data from the database and assign it to a...
考虑下面的SQL语句: -- 建表 create table t1(id int); -- 插入 insert into t1 values(1),(2),(3); -- 查询 select * from t1 where id = 1; 1. 2. 3. 4. 5. 6. 对于select语句,由于我们并没有为t1表创建索引,所以只能通过全表遍历的方式来执行查询。全表遍历会遍历表的所有块,逐条获取...
In eitherenvironment, the PL/SQL engine accepts as input any valid PL/SQL unit. Theengine runs procedural statements, but sends SQL statements to the SQL enginein the database, as shown inFigure1-1. --PL/SQL 引擎接收任何有效的PL/SQL 单元,然后执行里面的过程语句,但是对于SQL 语句会丢给SQL...
In eitherenvironment, the PL/SQL engine accepts as input any valid PL/SQL unit. Theengine runs procedural statements, but sends SQL statements to the SQL enginein the database, as shown in Figure1-1. --PL/SQL 引擎接收任何有效的PL/SQL 单元,然后执行里面的过程语句,但是对于SQL...
1.2.2SELECT Statements that Reference Collections TheBULK COLLECT INTO clause can improve the performance of queries that reference collections. You can use BULK COLLECT INTO with tables of scalar values, or tables of %TYPE values. The PL/SQL block inExample 6-10queries multiple values into PL/...
Using Identifiers in PL/SQL Assigning Values to a Variable With the Assignment Operator Using Literals Declaring Variables With the DEFAULT Keyword or NOT NULL Constraint Assigning Values to a Variable With the PL/SQL SELECT INTO Statement Using %TYPE and %ROWTYPE Attributes to Declare Ident...
I assumed that we already have CUSTOMERS table created in our database as mentioned in the PL/SQL - Variables chapter.CREATE OR REPLACE PACKAGE BODY cust_sal AS PROCEDURE find_sal(c_id customers.id%TYPE) IS c_sal customers.salary%TYPE; BEGIN SELECT salary INTO c_sal FROM customers WHERE ...
You can now select multiple statements The complete statement text can now be expanded/collapsed Semi-colon added when recalling a single SQL statement Recall directory preference now accepts environment variablesConnection enhancementsFor each connection you can now define an initialization script that ...
PL/SQL stands for "Procedural Language Extension of SQL". PL/SQL uses a block-structured syntax. Each of the logical blocks of PL/SQL can be nested into any number of subblocks.This section contains the PL/SQL MCQs on various topics such as Variables, Constants, Literals, Case, Loop, ...
seen more and more business logic and application logic move into the Oracle Server, so that PL/SQL programming has become a significant part of the total development process. PL/SQL Developer focuses on ease of use, code quality and productivity, key advantages during Oracle application ...