Select value into a column type variable : TYPE « PL SQL Data Types « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » PL SQL Data Types » TYPE 
21. 28. 7. Select value into a column type variable
SQL>
SQL> CREATE TABLE accounts(
  2    account_id  NUMBER  NOT NULL  PRIMARY KEY,
  3    balance  NUMBER );

Table created.

SQL>
SQL> INSERT INTO accounts(account_id,balance )VALUES(1,1000 );

row created.

SQL> INSERT INTO accounts(account_id,balance )VALUES(2,800 );

row created.

SQL>
SQL>
SQL> CREATE OR REPLACE FUNCTION account_balance(
  2    account_id_in IN accounts.account_id%TYPE)
  3  RETURN accounts.balance%TYPE
  4  IS
  5    l_balance  accounts.balance%TYPE;
  6  BEGIN
  7    SELECT balance
  8      INTO l_balance
  9      FROM accounts
 10     WHERE account_id = account_id_in;
 11
 12    RETURN l_balance;
 13
 14  END account_balance;
 15  /

Function created.

SQL>
SQL> CREATE OR REPLACE PROCEDURE apply_balance(
  2    account_id_in IN accounts.balance%TYPE,
  3    balance_in IN accounts.balance%TYPE)
  4  IS
  5  BEGIN
  6    UPDATE accounts
  7       SET balance = balance - balance_in
  8     WHERE account_id = account_id_in;
  9  END apply_balance;
 10  /

Procedure created.

SQL>
SQL>
SQL>
SQL>
SQL> DECLARE
  2     account_id  accounts.account_id%TYPE := 2;
  3     balance_remaining  accounts.balance%TYPE;
  4  BEGIN
  5     LOOP
  6
  7        balance_remaining := account_balance (account_id);
  8
  9
 10        EXIT WHEN balance_remaining < 1000;
 11
 12
 13        apply_balance (account_id, balance_remaining);
 14     END LOOP;
 15  END;
 16  /

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL> drop table accounts;

Table dropped.

SQL>
21. 28. TYPE
21. 28. 1. Variables Based on Database Columns
21. 28. 2. PL/SQL allows you to use the %type attribute in a nesting variable declaration.
21. 28. 3. You may also specify a variable's type using the %TYPE keyword, which tells PL/SQL to use the same type as a specified column in a table.
21. 28. 4. The %TYPE Command Illustrated
21. 28. 5. Using %TYPE and %ROWTYPE on Row Objects
21. 28. 6. Column type parameters
21. 28. 7. Select value into a column type variable
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