IT Nursery
I can find syntax “charts” on this on the SQLite website, but no examples and my code is crashing. I have other tables with unique constraints on a single...
I have a Java bean. Now, I want to be sure that the field should be unique. I am using the following code: @UniqueConstraint(columnNames={"username"}) public String username; But I’m...
Trying to create this example table structure in Postgres 9.1: CREATE TABLE foo ( name VARCHAR(256) PRIMARY KEY ); CREATE TABLE bar ( pkey SERIAL PRIMARY KEY, foo_fk VARCHAR(256)...
I have the following table: tickername | tickerbbname | tickertype ------------+---------------+------------ USDZAR | USDZAR Curncy | C EURCZK | EURCZK Curncy | C EURPLN | EURPLN Curncy | C...
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...
I have an email column that I want to be unique. But I also want it to accept null values. Can my database have 2 null emails that way?...
I have a table: table votes ( id, user, email, address, primary key(id), ); Now I want to make the columns user, email, address unique (together). How do I...