Oracle: Programs
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This document provides examples of using different PL/SQL commands to manipulate and retrieve data. It discusses commenting code, using functions, operators, and the SELECT, INSERT, UPDATE, DELETE, and MERGE commands. For example, it shows how to select a user's age from a table and store it in a variable, insert a new record into a table, update a user's age, and delete records matching certain criteria. The MERGE command is used to synchronize data between two tables by either updating matching rows or inserting new ones.
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![6RETRIEVING DATA We can retrieve data using the SELECT command. Variables are used to store the values returned from the SELECT statement and hence have to be of the same datatype and be declared before use.SYNTAX:SELECT column, […column] INTO variable_name,[…variable_name]FROM table_nameWHERE { expression….};EXAMPLE:DECLAREeage NUMBER; BEGIN SELECT age INTO eage FROM InfoTable WHERE name = ‘bill’; DBMS_OUTPUT.PUT_LINE(‘ Age of bill is : ‘ || eage); END](https://image.slidesharecdn.com/oracleppt7programsdone-100409082725-phpapp01/85/Oracle-Programs-6-320.jpg)
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