Baishampayan Ghose Baishampayan Ghose - 24 days ago 6
SQL Question

How do I ALTER a PostgreSQL table and make a column unique?

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

Answer

I figured it out from the PostgreSQL docs, the exact syntax is:

ALTER TABLE the_table ADD CONSTRAINT constraint_name UNIQUE (thecolumn);

Thanks Fred.