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@rice.edu> 
NSBRI Research Scientist/Programmer
Computer and Information Technology Institute
Rice University, 6100 S. Main St.,  Houston, TX 77005