In relational databases, which of the following best describes the role of a "foreign key"?
A foreign key is a column or group of columns in one table that refers to the primary key of another table, thus creating a relationship between the two tables. This key ensures referential integrity , meaning that the data in the foreign key column must match existing data in the primary key column of the referenced table. Referential integrity prevents orphaned records and maintains the consistency of the data across the database. A (Incorrect): This describes a primary key , not a foreign key. C (Incorrect): Foreign keys may allow duplicate values if the relationship permits it, but this is not their defining characteristic. D (Incorrect): While a foreign key references the primary key of another table, it is not itself the primary key of the current table. E (Incorrect): Foreign keys are not used solely for indexing; their main purpose is to enforce relationships between tables.
My sister brought a few rice while coming from the market. /No error
Apple Inc. has refurbished (A) / a controversial policy that (B) / took a 30% cut of payments (C) / when video apps on (D) / it’s platform sold TV...
When you are travelling with other women it’s a sort of a safety net which also gives you the courage to explore our dreams, knowing that the othe...
There is no scientific basis for (1)/a pregnant woman to be advised (2)/complete bed rest in early pregnancy (3)/until she has had some bleeding (4).
I need a much (A) / highest ladder to (B) / climb on the roof (C)/ and grab all the stuff. (D) / No error (E).
The 91 year old lady have been a fan of cricket for decades. /No error
The given sentence has been broken up into four different parts. The error, if any, will be in one or more parts of the sentence. Select the option whi...
Each of the candidates (1)/ have to submit (2)/ their application forms (3)/ by the end of the day. (4)
Ann received the promotion instead of Susan (A) / as Ann is senior than Susan in age (B)/ though Susan had worked there before Ann.(C)/ No error(D)
The president knows that the polarisation of the electorate turned even bitterer over his policy agenda.