What is the maximum number of PRIMARY KEY constraints allowed for a table? ( refer to the tables in the JustLee Books database). a. 1 b. 2 c. 30 d. 255

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Basic SQL Queries

Structured Query Language is the full form of SQL. It is a high-level language used to communicate with a relational database. It is used for creating, storing and accessing contents of a relational database. SQL is used to write the queries which are executed using database engines like Oracle, SQL Server and so forth.