Which key declares that an index in one table is related to that in another?(a) primary(b) secondary(c) foreign(d) crossI got this question in homework.My doubt is from Foreign Keys and Referential Integrity in section Using SQL to Manage Data of MySQL

Which key declares that an index in one table is related to that in an

1.	Which key declares that an index in one table is related to that in another?(a) primary(b) secondary(c) foreign(d) crossI got this question in homework.My doubt is from Foreign Keys and Referential Integrity in section Using SQL to Manage Data of MySQL
Answer» Right option is (C) foreign The explanation is: In MySQL, a foreign key is the ONE which facilitates INDEX relations ACROSS tables. It declares that an index in one table is related to that in another and place constraints.

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