Mixing
Multi-level primary key?
I have a fairly simple users table as follows:
CREATE TABLE users (
host VARCHAR NOT NULL,
username VARCHAR,
password VARCHAR NOT NULL,
PRIMARY KEY (host, username)
);
Password generally doesn't matter as far as PK goes. However, username can sometimes be NULL (hence lack of NOT NULL on it), meaining the specific host tells users apart through password only. In that case I'd like the password to be a part of PK too.
My initial attempt was
PRIMARY KEY (host, coalesce(username, password))
But that's not valid syntax apparently, at least not in SQLite3.
Is there any way I can achieve this using pure SQL?
sqlite3
asked Jan 2 at 17:38
ravilovravilov
5119
add a comment |
I have a fairly simple users table as follows:
CREATE TABLE users (
host VARCHAR NOT NULL,
username VARCHAR,
password VARCHAR NOT NULL,
PRIMARY KEY (host, username)
);
Password generally doesn't matter as far as PK goes. However, username can sometimes be NULL (hence lack of NOT NULL on it), meaining the specific host tells users apart through password only. In that case I'd like the password to be a part of PK too.
My initial attempt was
PRIMARY KEY (host, coalesce(username, password))
But that's not valid syntax apparently, at least not in SQLite3.
Is there any way I can achieve this using pure SQL?
sqlite3
asked Jan 2 at 17:38
ravilovravilov
5119
add a comment |
I have a fairly simple users table as follows:
CREATE TABLE users (
host VARCHAR NOT NULL,
username VARCHAR,
password VARCHAR NOT NULL,
PRIMARY KEY (host, username)
);
Password generally doesn't matter as far as PK goes. However, username can sometimes be NULL (hence lack of NOT NULL on it), meaining the specific host tells users apart through password only. In that case I'd like the password to be a part of PK too.
My initial attempt was
PRIMARY KEY (host, coalesce(username, password))
But that's not valid syntax apparently, at least not in SQLite3.
Is there any way I can achieve this using pure SQL?
sqlite3
asked Jan 2 at 17:38
ravilovravilov
5119
I have a fairly simple users table as follows:
CREATE TABLE users (
host VARCHAR NOT NULL,
username VARCHAR,
password VARCHAR NOT NULL,
PRIMARY KEY (host, username)
);
Password generally doesn't matter as far as PK goes. However, username can sometimes be NULL (hence lack of NOT NULL on it), meaining the specific host tells users apart through password only. In that case I'd like the password to be a part of PK too.
My initial attempt was
PRIMARY KEY (host, coalesce(username, password))
But that's not valid syntax apparently, at least not in SQLite3.
Is there any way I can achieve this using pure SQL?
sqlite3
sqlite3
asked Jan 2 at 17:38
ravilovravilov
5119
asked Jan 2 at 17:38
ravilovravilov
5119
asked Jan 2 at 17:38
ravilovravilov
5119
asked Jan 2 at 17:38
ravilovravilov
5119
asked Jan 2 at 17:38
ravilovravilov
5119
5119
add a comment |
add a comment |
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