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Don Burleson Blog 







Oracle Character Functions

Oracle Database Tips by Donald Burleson

Oracle Character Functions

Oracle character functions are used to modify a char or varchar2 column.  You may need to modify a column before comparing it to another value, or you may need it in a different format than it is stored in the database. Oracle character functions allow you to do this.  Sometimes we don't know how the characters are stored, so we use an Oracle character function can insure that the column formatted the way we need it, even if we don't know how the characters are stored.

upper(…)/lower(…)/initcap (…)

Both the upper and lower Oracle character functions accept a character string and convert all the characters to either upper case or lower case. 

Another Oracle character function is the initcapfunction.  As the name implies, the Oracle initcap character function capitalizes only the first character of each word. 

Let's look at an example of each type of Oracle character function: 

Notice that I formatted the output of my Oracle character functions for easy reading.  I set my SQL*Plus parameters, defined my columns, created my query using the Oracle character functions, and then reset my environment. Remember, when you define a column in SQL*Plus, like we did with these character functions, it will stay defined and will by applied to any column returning with that name until you CLEAR it or exit SQL*Plus.





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