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SQL: Unique and Foreign key of a column from other table's column which itself is neither Unique nor Primary key

原文 2022-01-15 17:45:06 5 1 sql/ foreign-keys/ constraints/ unique

I have a column which in neither unique nor primary key in a table. But i want that be be as a foreign key as well as unique in other table column

Table_1 as below which has a column_whichIsNeitherUniqueNorPK

Now i have Table_2 which has a column " FK_column_whichIsNeitherUniqueNorPK " in which i want this columns values as Foreign key of above table, and this column should be Unique.

1 answers

so as per comments, it looks like it is not possible directly as it deviates from relational theory. For a column to be Foreign key, the other column has to be unique

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SQL: Unique and Foreign key of a column from other table's column which itself is neither Unique nor Primary key

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1 answers

solution1 0 2022-01-15 17:54:00

solution1
0 2022-01-15 17:54:00