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  Tutorial: Database Structured Query Language Beginning SQL Programming: Part 2 Tutorial

This second installment covers procedural versus declarative languages, SQL's place in the data center and obtaining SQL. This book will furnish readers with a firm grasp of SQL concepts that you can work with straight away, as well as provide solid found

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Database Structured Query Language Beginning SQL Programming: Part 2 Tutorial

We mentioned at the beginning of the chapter, that SQL is not a procedural language. Before we move on to look at how we can actually implement SQL, we'll first see exactly what we mean by a declarative rather than procedural language. Many readers will have experience in languages like Visual Basic or C++ in which they mastered how to write a series of statements in order to achieve a goal. You have probably even used these commands to "walk through" a set of data checking to see if each item is the item of interest. If you wanted to change data you wrote a series of steps that somehow opened up the datastore, then put a pointer in the correct location, modified the data, moved to the next bit of data (all the while checking if you were at the end of the data yet), modified the next record and finished by closing the datastore. In a procedural language we tell the computer each step to perform. The computer performs those steps and, if they are well written, we will end up with our desired result.


 

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Database Structured Query Language Beginning SQL Programming: Part 2 Tutorial

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