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'Cause when I was gonna remake the relationships in my table 1:1 1:1 -------- 1.1____ (With the dash in the middle but the straight line)
What’s the difference between us?
1 answer
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The difference in dashes has to do with the use of primary keys from one table to another.
In case you use --- you will retrieve the primary key from the table with which you are making the relation, and it will remain the secondary key. In the case of ___, imports primary key from one table to the other, but now staying as primary key and not as secondary.
I think the following picture illustrates well what I mean:
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