Question

I need to be able to enter duplicate entries in Table B, with different foreign keys (Table B references Table A’s key). Like this:

Table A:
Record with key of 11
Record with key of 22

Table B:
Record referring to Table A record 11, with a field marked unique: value 101
Record referring to Table A record 22, with a field marked unique: value 101  <--- violates the unique key

This is what I have tried, but didn’t work:

CREATE TABLE Readings (
    SITE_ID TEXT REFERENCES SiteData
    , LOOP_NBR TEXT
    , LOOP_CLOSED BINARY
    , SEQ INTEGER
    , STA TEXT UNIQUE
    , BS TEXT
    , FS TEXT
    , HI TEXT
    , DESC TEXT
 )  

INSERT INTO Readings (SITE_ID, SEQ) VALUES (' + databaseKey + ', 0)

Anybody know how to do this?

Answer 1

CREATE TABLE Readings (
    SITE_ID TEXT UNIQUE REFERENCES SiteData 
    , LOOP_NBR TEXT
    , LOOP_CLOSED BINARY
    , SEQ INTEGER
    , STA TEXT UNIQUE
    , BS TEXT
    , FS TEXT
    , HI TEXT
    , DESC TEXT
 )

Adding UNIQUE to the foreign key will refuse only rows with same SITE_ID and STA