C++ Programming |
| Posted: 06 May 2013 07:34 AM PDT Relational Algebra. Relational algebras received little attention until the publication of E.F. Codd's relational model of data in 1970. Codd proposed such an algebra as a basis for database query languages. The first query language to be based on Codd's algebra was ISBL, and this pioneering work has been acclaimed by many authorities as having shown the way to make Codd's idea into a useful  |
| Posted: 06 May 2013 07:18 AM PDT Parentheses are classed as operators by the compiler, although their position is a bit unclear. They have a value in the sense that they assume the value of whatever expression is inside them. Parentheses are used for forcing a priority over operators. If an expression is written out in an ambiguous way, such as: a + b / 4 * 2 it is not clear what is meant by this. It could be interpreted in  |
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