Oracle DB: How can I write query ignoring case?

Question

As I had written in title, I have SQL query, run on Oracle DB, lets say:

SELECT * FROM TABLE WHERE TABLE.NAME Like \'IgNoReCaSe\'

If I woul

Answer 1

Select * from table where upper(table.name) like upper('IgNoreCaSe');

Alternatively, substitute lower for upper.

Answer 2

You can convert both values to upper or lowercase using the upper or lower functions:

Select * from table where upper(table.name) like upper('IgNoreCaSe')

or

Select * from table where lower(table.name) like lower('IgNoreCaSe');

Answer 3

You can use either lower or upper function on both sides of the where condition

Answer 4

You can use ALTER SESSION statements to set comparison to case-insensitive. See this FAQ.

alter session set NLS_COMP=ANSI;
alter session set NLS_SORT=BINARY_CI;

For all those visiting 8 years after this original answer has been accepted (for 10gR2):

After 10gR2, the NLS_COMP setting must be `LINGUISTIC':

ALTER SESSION SET NLS_COMP=LINGUISTIC;

Answer 5

You can use the upper() function in your query, and to increase performance you can use a function-base index

 CREATE INDEX upper_index_name ON table(upper(name))

Answer 6

You could also use Regular Expressions:

SELECT * FROM TABLE WHERE REGEXP_LIKE (TABLE.NAME,'IgNoReCaSe','i');