:original_name: ddm_03_0063.html

.. _ddm_03_0063:

Functions
=========

Supported Functions
-------------------

.. table:: **Table 1** Operator functions

   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | Expression    | Example                                                                                                                                                                |
   +===============+========================================================================================================================================================================+
   | IN            | SELECT \* FROM Products WHERE vendor_id IN ( 'V000001', 'V000010' ) ORDER BY product_price                                                                             |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | NOT IN        | SELECT product_id, product_name FROM Products WHERE vendor_id NOT IN ('V000001', 'V000002') ORDER BY product_id                                                        |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | BETWEEN       | SELECT id, product_id, product_name, product_price FROM Products WHERE id BETWEEN 000005 AND 000034 ORDER BY id                                                        |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | NOT...BETWEEN | SELECT product_id, product_name FROM Products WHERE NOT vendor_id BETWEEN 'V000002' and 'V000005' ORDER BY product_id                                                  |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | IS NULL       | SELECT product_name FROM Products WHERE product_price IS NULL                                                                                                          |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | IS NOT NULL   | SELECT id, product_name FROM Products WHERE product_price IS NOT NULL ORDER BY id                                                                                      |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | AND           | SELECT \* FROM Products WHERE vendor_id = 'V000001' AND product_price <= 4000 ORDER BY product_price                                                                   |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | OR            | SELECT \* FROM Products WHERE vendor_id = 'V000001' OR vendor_id = 'V000009'                                                                                           |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | NOT           | SELECT product_id, product_name FROM Products WHERE NOT vendor_id = 'V000002'                                                                                          |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | LIKE          | SELECT \* FROM Products WHERE product_name LIKE 'NAME%' ORDER BY product_name                                                                                          |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | NOT LIKE      | SELECT \* FROM Products WHERE product_name NOT LIKE 'NAME%' ORDER BY product_name                                                                                      |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | CONCAT        | SELECT product_id, product_name, CONCAT( product_id , '(', product_name ,')' ) AS product_test FROM Products ORDER BY product_id                                       |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | |image2|      | SELECT 3 \* 2+5-100/50                                                                                                                                                 |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | ``-``         | SELECT 3 \* 2+5-100/50                                                                                                                                                 |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | \*            | SELECT order_num, product_id, quantity, item_price, quantity*item_price AS expanded_price FROM OrderItems WHERE order_num BETWEEN 000009 AND 000028 ORDER BY order_num |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | /             | SELECT 3 \* 2+5-100/50                                                                                                                                                 |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | UPPER         | SELECT id, product_id, UPPER(product_name) FROM Products WHERE id > 10 ORDER BY product_id                                                                             |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | LOWER         | SELECT id, product_id, LOWER(product_name) FROM Products WHERE id <= 10 ORDER BY product_id                                                                            |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | SOUNDEX       | SELECT \* FROM Vendors WHERE SOUNDEX(vendor_name) = SOUNDEX('test') ORDER BY vendor_name                                                                               |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | IFNULL        | SELECT IFNULL(product_id, 0) FROM Products;                                                                                                                            |
   +---------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

.. table:: **Table 2** Time and date functions

   +-----------------------------------+------------------------------------------------------+
   | Expression                        | Example                                              |
   +===================================+======================================================+
   | DAY()                             | SELECT \* FROM TAB_DATE WHERE DAY(date)=21           |
   |                                   |                                                      |
   |                                   | SELECT \* FROM TAB_DATE WHERE date='2018-12-21'      |
   |                                   |                                                      |
   |                                   | INSERT INTO TAB_DATE(id,date) VALUES(1,'2018-05-22') |
   +-----------------------------------+------------------------------------------------------+
   | MONTH()                           | SELECT \* FROM TAB_DATE WHERE MONTH(date)=12         |
   |                                   |                                                      |
   |                                   | SELECT \* FROM TAB_DATE WHERE date='2018-12-21'      |
   |                                   |                                                      |
   |                                   | INSERT INTO TAB_DATE(id,date) VALUES(1,'2018-05-22') |
   +-----------------------------------+------------------------------------------------------+
   | YEAR()                            | SELECT \* FROM TAB_DATE WHERE YEAR(date)=2018        |
   |                                   |                                                      |
   |                                   | SELECT \* FROM TAB_DATE WHERE date='2018-12-21'      |
   |                                   |                                                      |
   |                                   | INSERT INTO TAB_DATE(id,date) VALUES(1,'2018-05-22') |
   +-----------------------------------+------------------------------------------------------+

.. table:: **Table 3** Mathematical functions

   +------------+-----------------------------------------------------------------------------------------------------------------------------+
   | Expression | Example                                                                                                                     |
   +============+=============================================================================================================================+
   | SQRT()     | SELECT id, product_price, SQRT(product_price) AS price_sqrt FROM Products WHERE product_price < 4000 ORDER BY product_price |
   +------------+-----------------------------------------------------------------------------------------------------------------------------+
   | AVG()      | SELECT AVG(product_price) AS avg_product FROM Products                                                                      |
   +------------+-----------------------------------------------------------------------------------------------------------------------------+
   | COUNT()    | SELECT COUNT(``*``) AS num_product FROM Products                                                                            |
   +------------+-----------------------------------------------------------------------------------------------------------------------------+
   | MAX()      | SELECT id, product_id, product_name, MAX(product_price) AS max_price FROM Products ORDER BY id                              |
   +------------+-----------------------------------------------------------------------------------------------------------------------------+
   | MIN()      | SELECT id, product_id, product_name, MIN(product_price) AS min_price FROM Products ORDER BY id                              |
   +------------+-----------------------------------------------------------------------------------------------------------------------------+
   | SUM()      | SELECT SUM(product_price) AS sum_product FROM Products                                                                      |
   +------------+-----------------------------------------------------------------------------------------------------------------------------+

Unsupported Functions
---------------------

.. table:: **Table 4** Function restrictions

   =========== ==========================================
   Item        Restriction
   =========== ==========================================
   ROW_COUNT() Function **ROW_COUNT()** is not supported.
   =========== ==========================================

.. |image1| image:: /_static/images/en-us_image_0000001749511672.png
.. |image2| image:: /_static/images/en-us_image_0000001749511672.png