Re: [SQL] Case insensitive searchs

There's more than one way to do it, and some interesting SQL text functions
to use with it, as well, as demonstrated by the example below:

test=> create table addr_table (city text, state text);
CREATE
test=> insert into addr_table values ('SAN ANTONIO', 'TX');
INSERT 25354 1
test=> insert into addr_table values ('San Antonio', 'TX');
INSERT 25355 1
test=> insert into addr_table values ('San antonio', 'tx');
INSERT 25356 1
test=> insert into addr_table values ('san antonio', 'Tx');
INSERT 25357 1
test=> select * from addr_table;
city |state
-----------+-----
SAN ANTONIO|TX
San Antonio|TX
San antonio|tx
san antonio|Tx
(4 rows)

test=> select * from addr_table group by city;
city |state
-----------+-----
SAN ANTONIO|TX
San Antonio|TX
San antonio|tx
san antonio|Tx
(4 rows)

test=> select * from addr_table group by lower(city);
city |state
-----------+-----
SAN ANTONIO|TX
(1 row)

test=> select initcap(city),upper(state) from addr_table group by lower(city);
initcap |upper
-----------+-----
San Antonio|TX
(1 row)

test=> select distinct initcap(city),upper(state) from addr_table;
initcap |upper
-----------+-----
San Antonio|TX
(1 row)

> I have a table that has city names in it. Some of the cities have a number
> of different cases. For instance I may have:
>
> San Antonio
> san antonio
> San antonio
> SAN ANTONIO
>
> My question is how can I do a distinct search for all cities and only get
> one of each city?

HTH,
Ross

--
Ross J. Reedstrom, Ph.D., <reedstrm(at)rice(dot)edu>
NSBRI Research Scientist/Programmer
Computer and Information Technology Institute
Rice University, 6100 S. Main St., Houston, TX 77005