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There are two types of database management systems – relational and non-relational. There are four categories in which the SQL commands have been separated into. The difference between DDL, DML, DCL, and TCL can be explained in our tutorial Why You Should Learn SQL. The most frequently used tools in SQL are one of the most frequently-used tools in your job, regardless of your job. For example, define an inner key constraint to maintain integrity of a database. The foreign key constraint comprises a set of rules, or limits, that will ensure that the values in the child and parent tables.