If a table column has is UNIQUE and has NOT NULL, is it
equivalent to a PRIMARY KEY column?
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Answer Posted / raam
No. Generally Primary Key contains Unique + NotNull values.
If we are not defined a column as Primay Key and we defined
as Unique + NotNull, then, the behavior of that particular
column in that particular table looks like primary key. but
this cannot be referenced in any other table as we have not
defined as primary key..So, Primary Key column is different
from the column which have Unique + Not Null qualities.
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