DB2 – Constraints This chapter describes various constraints in the database. Introduction To enforce database integrity, a set of rules is defined, called constraints. The constraints either permit or prohibit the values in the columns. In a Real time database activities, the data should be added with certain restrictions. For example, in a sales database, […]
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DB2 – Tables Tables are logical structure maintained by Database manager. In a table each vertical block called as column (Tuple) and each horizontal block called as row (Entity). The collection of data stored in the form of columns and rows is known as a table. In tables, each column has different data type. Tables […]