Foreign keys are the columns of a table that points to the primary key of another table. They act as a cross-reference between tables.
In detail : A Foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table. In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table.
In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
1. Four famous Sikh shrines in Delhi will go green
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