The data manipulation language (DML) is used to create, read, update, and delete data from a table. The data definition language (DDL) is used to create and alter the structure of the database itself, like creating a table, it’s columns, define and modify the primary and foreign keys, stored procedures, delete columns, tables, and even the entire database. Your SQL statements should require a variety of SQL capabilities, such as various kinds of join, aggregate functions, etc. (This presupposes a good initial domain choice.)
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