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Ryan Quinn
2,027 PointsCreating Primary and Unique Keys
The Question is:
Create a genres table called "t_genres" with an auto incrementing primary key called "pk_id" and a unique column called "uk_name" that can't be null. The "uk_name" is a varchar of up to 45 characters.
I cannot seem to write a proper statement for this one.
3 Answers
Ryan Chatterton
5,914 PointsMS SQL:
create table t_genres (
pk_id int IDENTITY(1,1) Primary key,
uk_name varchar(45) not null
constraint uc_name unique (uk_name)
)
insert into t_genres (uk_name)
values ('bob')
go
insert into t_genres (uk_name)
values ('bob')
for MySql:
create table t_genres (
pk_id int not null auto_increment primary key,
uk_name varchar(45) not null,
unique (uk_name)
)
now to pass the challenge which is a bug in my book.
create table t_genres (
pk_id int not null PRIMARY KEY auto_increment, uk_name varchar(45), unique(uk_name)
);
bug being the PRIMARY KEY they are saying must come before auto_increment which is not true.
Ryan Quinn
2,027 PointsI appreciate your help, but neither of those passes the challenge. I can't figure it out.
Ryan Chatterton
5,914 PointsThe very last one will. That's what I wrote to pass the challenge.
Ryan Quinn
2,027 PointsThank you for your help Ryan.