{"id":17151,"date":"2020-10-11T12:25:27","date_gmt":"2020-10-11T12:25:27","guid":{"rendered":"https:\/\/dbtut.com\/?p=17151"},"modified":"2020-10-11T15:27:02","modified_gmt":"2020-10-11T15:27:02","slug":"oracle-pl-sql-functions","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2020\/10\/11\/oracle-pl-sql-functions\/","title":{"rendered":"Oracle PL\/SQL Functions"},"content":{"rendered":"

This article contains information about PL\/SQL Functions, and examples.<\/p>\n

What is Function in Oracle?<\/h2>\n

Oracle PL\/SQL functions structure are structures that can store commands under a name in the database and can be run again if needed as in the procedure structure.<\/p>\n

What is the Difference Between Function and Stored procedure in Oracle?<\/h3>\n

The difference of the functions from the procedures is that they have to return values.<\/p>\n

The keywords to be used when creating the function are as follows.<\/p>\n

CREATE [OR REPLACE] FUNCTION function_name\r\n[(parameter_name [IN | OUT | IN OUT] data_type [, ...])]\r\nRETURN return_data_type\r\n{IS | AS}\r\nBEGIN\r\n    -- Commands\r\nEND [function_name];<\/pre>\n
An example of creating a function with Oracle PL \/ SQL is as follows.<\/p>\n
CREATE OR REPLACE function SUM_Function (\r\n    S1 IN PLS_INTEGER,\r\n    S2 IN PLS_INTEGER\r\n)\r\nRETURN PLS_INTEGER\r\nIS\r\nBEGIN\r\n    RETURN S1 + S2;\r\nEND;<\/pre>\n
We can run the functions as below;<\/p>\n
BEGIN\r\n    DBMS_OUTPUT.put_line(SUM_Function(10, 20));\r\nEND;<\/pre>\n
SYS.all_objects table can be used to get information about the created functions.<\/p>\n
SELECT * FROM SYS.all_objects WHERE OBJECT_TYPE = 'FUNCTION' AND OWNER = 'USER_NAME';<\/pre>\n
The following command is used to delete a function.<\/p>\n
DROP FUNCTION function_name;<\/pre>\n
DROP FUNCTION SUM_Function;<\/pre>\n
The reason for using the functions is to perform operations where the functions in Oracle are insufficient.<\/p>\n
PL SQL Function Example with parameters<\/h2>\n
The function that converts the first letter in a text to uppercase can be written as follows.<\/p>\n
CREATE OR REPLACE function CONVERT_FIRST_LETTER_TO_UPPERCASE (\r\n    MYTEXT IN VARCHAR2\r\n)\r\nRETURN VARCHAR2\r\nIS\r\nBEGIN\r\n    RETURN UPPER(SUBSTR(MYTEXT, 1, 1)) || LOWER(SUBSTR(MYTEXT, 2));\r\nEND;<\/pre>\n
You can run the function as below;<\/p>\n
BEGIN\r\n    DBMS_OUTPUT.put_line(CONVERT_FIRST_LETTER_TO_UPPERCASE('HELLO!'));\r\n    DBMS_OUTPUT.put_line(CONVERT_FIRST_LETTER_TO_UPPERCASE('hello!'));\r\nEND;<\/pre>\n
In addition, functions can be used for calculating a continuously used process (such as VAT calculation).<\/p>\n
You can find more detailed information about below topics in the below link.<\/p>\n
PL\/SQL Tutorial<\/a><\/strong><\/p>\n
You will find below topics in this article.<\/p>\n
    \n
  1. What is PL\/SQL<\/strong><\/a><\/li>\n
  2. Oracle PL\/SQL Data Types and Variables and Literals<\/strong><\/a><\/li>\n
  3. Oracle PL\/SQL Operators<\/strong><\/a><\/li>\n
  4. Oracle PL\/SQL Conditional Statements<\/strong><\/a><\/li>\n
  5. Oracle PL\/SQL Loops<\/strong><\/a><\/li>\n
  6. Oracle PL\/SQL Procedures and Procedure Parameters<\/strong><\/a><\/li>\n
  7. Oracle PL\/SQL Functions<\/strong><\/a><\/li>\n
  8. Oracle PL\/SQL Cursor<\/strong><\/a><\/li>\n
  9. Oracle PL\/SQL Records<\/strong><\/a><\/li>\n
  10. Oracle PL\/SQL Exception<\/strong><\/a><\/li>\n
  11. Oracle PL\/SQL Trigger<\/strong><\/a><\/li>\n
  12. Oracle PL\/SQL Packages<\/strong><\/a><\/li>\n
  13. Oracle PL\/SQL Collections<\/strong><\/a><\/li>\n<\/ol>\n
    You can find more information about functions at docs.oracle.com<\/a><\/p>\n
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    <\/div>\n","protected":false},"excerpt":{"rendered":"
    This article contains information about PL\/SQL Functions, and examples. What is Function in Oracle? Oracle PL\/SQL functions structure are structures that can store commands under a name in the database and can be run again if needed as in the procedure structure. What is the Difference Between Function and Stored procedure in Oracle? The difference …<\/p>\n
    <\/div>\n
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    <\/div>\n","protected":false},"author":485,"featured_media":17152,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[4],"tags":[10080,10081,10082],"class_list":["post-17151","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-oracle","tag-pl-sql-function-example-with-parameters","tag-what-is-function-in-oracle","tag-what-is-the-difference-between-function-and-stored-procedure-in-oracle"],"aioseo_notices":[],"yoast_head":"\nOracle PL\/SQL Functions - Database Tutorials<\/title>\n<meta name=\"description\" content=\"This article contains information about PL\/SQL Functions, and examples.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dbtut.com\/index.php\/2020\/10\/11\/oracle-pl-sql-functions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle PL\/SQL Functions - 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