Select count value into a variable : Select into « PL SQL Statements « Oracle PL/SQL Tutorial

SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(4 BYTE),
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /

Table created.

SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ('01','Jason',    'Martin',  to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto',  'Programmer')
  3  /

1 row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester')
  3  /

1 row created.

SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
  2  /


ID   FIRST_NAME LAST_NAME  START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01   Jason      Martin     25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison     Mathews    21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester

SQL>
SQL>
SQL>
SQL> DECLARE
  2     v_count NUMBER(10) := 0;
  3
  4  BEGIN
  5
  6     SELECT count(1)
  7     INTO v_count
  8     FROM employee
  9     WHERE id = 5;
 10
 11     IF v_count = 0
 12     THEN
 13        INSERT INTO employee (id, first_name, last_name)
 14        VALUES (5, 'Randy', 'Stauf');
 15     END IF;
 16     ROLLBACK;
 17  EXCEPTION
 18     WHEN OTHERS
 19     THEN
 20        DBMS_OUTPUT.PUT_LINE(SQLERRM);
 21  END;
 22  /

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /

Table dropped.

22.10.Select into
	22.10.1.	Use Select into statement to assign value to a variable
	22.10.2.	Multiple-Row SELECT Command with Several Exception-Handling Routines: set value in exception handler
	22.10.3.	Select data into record type data
	22.10.4.	Select data into PL/SQL table of cursor
	22.10.5.	Select count value into a variable
	22.10.6.	Use if statement to check the selected into value
	22.10.7.	Use more than one entrances in if statement to handle the value returned from a select into
	22.10.8.	Retrieving a single row: The basic syntax
	22.10.9.	Use IF-THEN-ELSE to check the return value from the select into statement
	22.10.10.	SELECT into ROWTYPE
	22.10.11.	SELECT into TYPE
	22.10.12.	Multiple-row SELECT command.
	22.10.13.	Multiple-row SELECT command with several exception-handling routines
	22.10.14.	Create a loop that prints a list of all employees and their managers
	22.10.15.	You must have the same datatypes in both the SELECT and INTO clauses.
	22.10.16.	select pair value into two variables
	22.10.17.	Build an anonymous block that will trigger an error.
	22.10.18.	Demo a SELECT INTO with exception handling
	22.10.19.	Select into and subquery