The Driver Relationship team wants to ensure that the all driving license IDs in the active drivers table have the length of 7. Alter the ACTIVE_DRIVERS table created in Chapter 8, Activity 1 to check the length of the DRIVER_DRIVING_LICENSE_ID. Add a CHECK to the ACTIVE_DRIVERS table to enforce a driver license length of 7. Test Query: SELECT DISTINCT(constraint_name) FROM information_schema.check_constraints WHERE constraint_schema = 'InstantRide' AND constraint_name = 'ACTIVE_DRIVERS_chk_1'   Expected Results CONSTRAINT_NAME ACTIVE_DRIVERS_chk_1

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Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.