Oracle - Select where field has lowercase characters

Question

I have a table, users, in an Oracle 9.2.0.6 database. Two of the fields are varchar - last_name and first_name.

When rows are inserted into this table, the first name a

Answer 1

If you are looking for Oracle 10g or higher you can use the below example. Consider that you need to find out the rows where the any of the letter in a column is lowercase.

Column1
.......
MISS
miss
MiSS

In the above example, if you need to find the values miss and MiSS, then you could use the below query

SELECT * FROM YOU_TABLE WHERE REGEXP_LIKE(COLUMN1,'[a-z]');

Answer 2

for SQL server where the DB collation setting is Case insensitive use the following:

SELECT * FROM tbl_user WHERE LEFT(username,1) COLLATE Latin1_General_CS_AI <> UPPER(LEFT(username,1))

Answer 3

I think BQ's SQL and Justin's second SQL will work, because in this scenario:

first_name        last_name
----------        ---------
bob               johnson
Bob               Johnson
BOB               JOHNSON

I want my query to return the first 2 rows.

I just want to make sure that this will be an efficient query though - my table has 500 million rows in it.

When you say upper(first_name) != first_name, is "first_name" always pertaining to the current row that oracle is looking at? I was afraid to use this method at first because I was afraid I would end up joining this table to itself, but they way you both wrote the SQL it appears that the equality check is only operating on a row-by-row basis, which would work for me.

Answer 4

How about this:

select id, first, last from mytable
where first != upper(first) or last != upper(last);

Answer 5

Try this:

SELECT * FROM YOU_TABLE WHERE REGEXP_LIKE(COLUMN1,'[a-z]','c'); => Miss, miss lower text
SELECT * FROM YOU_TABLE WHERE REGEXP_LIKE(COLUMN1,'[A-Z]','c'); => Miss, MISS upper text

Answer 6

 SELECT * 
 FROM mytable 
 WHERE FIRST_NAME IN (SELECT FIRST_NAME 
                      FROM MY_TABLE
                      MINUS 
                      SELECT UPPER(FIRST_NAME) 
                      FROM MY_TABLE )