The EXISTS Table Attribute : Table of Type « PL SQL « Oracle PL / SQL

1. Oracle PL / SQL
2. PL SQL
3. Table of Type

The EXISTS Table Attribute

    
SQL>
SQL>
SQL> CREATE TABLE lecturer (
  2    id               NUMBER(5) PRIMARY KEY,
  3    first_name       VARCHAR2(20),
  4    last_name        VARCHAR2(20),
  5    major            VARCHAR2(30),
  6    current_credits  NUMBER(3)
  7    );

Table created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10001, 'Scott', 'Lawson','Computer Science', 11);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major, current_credits)
  2                VALUES (10002, 'Mar', 'Wells','History', 4);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10003, 'Jone', 'Bliss','Computer Science', 8);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10004, 'Man', 'Kyte','Economics', 8);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10005, 'Pat', 'Poll','History', 4);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10006, 'Tim', 'Viper','History', 4);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10007, 'Barbara', 'Blues','Economics', 7);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10008, 'David', 'Large','Music', 4);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10009, 'Chris', 'Elegant','Nutrition', 8);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10010, 'Rose', 'Bond','Music', 7);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10011, 'Rita', 'Johnson','Nutrition', 8);

1 row created.

SQL>
SQL> INSERT INTO lecturer (id, first_name, last_name, major,current_credits)
  2                VALUES (10012, 'Sharon', 'Clear','Computer Science', 3);

1 row created.

SQL>
SQL> CREATE TABLE MyTable (
  2    num_col    NUMBER,
  3    char_col   VARCHAR2(60)
  4    );

Table created.

SQL>
SQL> DECLARE
  2    TYPE t_FirstNameTable IS TABLE OF lecturer.first_name%TYPE
  3      INDEX BY BINARY_INTEGER;
  4    FirstNames  t_FirstNameTable;
  5  BEGIN
  6    FirstNames(1) := 'Scott';
  7    FirstNames(3) := 'Joanne';
  8
  9    IF FirstNames.EXISTS(1) THEN
 10      INSERT INTO MyTable (char_col) VALUES
 11        ('Row 1 exists!');
 12    ELSE
 13      INSERT INTO MyTable (char_col) VALUES
 14        ('Row 1 doesn''t exist!');
 15    END IF;
 16    IF FirstNames.EXISTS(2) THEN
 17      INSERT INTO MyTable (char_col) VALUES
 18        ('Row 2 exists!');
 19    ELSE
 20      INSERT INTO MyTable (char_col) VALUES
 21        ('Row 2 does n''t exist!');
 22    END IF;
 23  END;
 24  /

PL/SQL procedure successfully completed.

SQL>
SQL> select * from MyTable;

   NUM_COL CHAR_COL
---------- ------------------------------------------------------------
           Row 1 exists!
           Row 2 does n't exist!

SQL>
SQL> drop table lecturer;

Table dropped.

SQL>
SQL> drop table MyTable;

Table dropped.

   
    
    
  

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