SQL AND, OR, NOT.

Selection with logical AND, OR, NOT

  • SQL provides the ability to select the table rows using a combination of logical expressions. The operators AND, OR, NOT or a combination of these are used to achieve this.
  • AND and OR are used in a logical comparison of two conditions.
  • The AND operator returns true if both the first condition and the second condition are true.
  • The OR operator returns true if either the first condition or the second condition are true.
  • The NOT operator is a negation so AND NOT operator returns true if the first condition is true and the second condition is false.
  • The NOT operator is a negation so OR NOT operator returns true if the first condition is true or the second condition is false.
    AND Example:
    MySQL, Oracle, SQL server, PostgreSQL:
    select isbn_no "ISBN for order < $100 >= $50" ,
      ITEM_QTY * price "Order in $"
      from order_books
      where ITEM_QTY * price < 100 AND ITEM_QTY * price >= 50 ;
    The result should be:
    ISBN for order < $100 >= $50 Order in $
    0201703092 78
    1861006314 58
    0764557599 84
    0471777781 64
    OR Example:
    MySQL, Oracle, SQL server, PostgreSQL:
    select isbn_no "ISBN for order > $100 OR < $50" ,
      ITEM_QTY * price "Order in $"
      from order_books
      where ITEM_QTY * price > 100 OR ITEM_QTY * price < 50 ;
    The result should be:
    ISBN for order > $100 OR < $50 Order in $
    0764557599 42
    1861002025 190
    0672325764 49
    0764579088 140
    0201703092 390
    1861002025 190
    1861006314 29
    Example:
    MySQL, Oracle, SQL server, PostgreSQL:
    select isbn_no "ISBN for order < $100 AND NOT < $70" ,
      ITEM_QTY * price "Order in $"
      from order_books
      where ITEM_QTY * price < 100 AND NOT ITEM_QTY * price < 70 ;
    The result should be:
    ISBN for order < $100 AND NOT < $70 Order in $
    0201703092 78
    0764557599 84
    Example:
    MySQL, Oracle, SQL server, PostgreSQL:
    select isbn_no "ISBN for order > $100 OR NOT > $30" ,
      ITEM_QTY * price "Order in $"
      from order_books
      where ITEM_QTY * price > 100 OR NOT ITEM_QTY * price > 30 ;
    The result should be:
    ISBN for order > $100 OR NOT > $30 Order in $
    1861002025 190
    0764579088 140
    0201703092 390
    1861002025 190
    1861006314 29
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