unique-constraint

I have a table in PostgreSQL where the schema looks like this: CREATE TABLE "foo_table" ( "id" serial NOT NULL PRIMARY KEY, "permalink" varchar(200) NOT NULL, "text" varchar(512) NOT NULL, "timestamp" timestamp with time zone NOT NULL ) Now I want to make the permalink unique across the table by ALTER-ing the table. Can anybody help me with this? TIA Baishampayan Ghose I figured it out from the PostgreSQL docs, the exact syntax is: ALTER TABLE the_table ADD CONSTRAINT constraint_name UNIQUE (thecolumn); Thanks Fred . Clint Pachl Or, have the DB automatically assign a constraint name using:

I need to catch violation of UNIQUE constraints in a special way by a C# application I am developing. Is it safe to assume that Error 2627 will always correspond to a violation of this kind, so that I can use if (ThisSqlException.Number == 2627) { // Handle unique constraint violation. } else { // Handle the remaing errors. } ? 2627 is unique constraint (includes primary key), 2601 is unique index SELECT * FROM sys.messages WHERE text like '%duplicate%' and text like '%key%' and language_id = 1033 Here is a handy extension method I wrote to find these: public static bool IsUniqueKeyViolation

I'm trying to populate a SQL table with a list of words. The table itself it pretty simple: CREATE TABLE WORDS( ID BIGINT AUTO_INCREMENT, WORD VARCHAR(128) NOT NULL UNIQUE, PRIMARY KEY(ID) ); The problem I'm running into is this: when I do the following inserts back to back INSERT INTO WORDS(WORD) VALUES('Seth'); INSERT INTO WORDS(WORD) VALUES('seth'); The second insert fails with a constraint violation ("Duplicate entry 'seth' for key 'WORD'"). How can I get the UNIQUE constraint on WORD to be case sensitive? Bill Brasky Looks like mysql is case insensitive by default : You probably need to