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Expressions
An expression is a randomly complex combination of the constants, variables, literals, operators, & function calls. The simplest expression is the single variable. The PL/SQL compilers determine the datatype of an expression from the types of the constants, variables, literals, and operators which comprise the expression. Every time the expression is computed, a single value of that type results.
Syntax:
i have an assignment of DBMS subject, this assignment is based on SQL server and power BI
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Literature review
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Define basic operators of relational algebra with an example each
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