internal implementation of database Queries

Posted by harigm on Stack Overflow See other posts from Stack Overflow or by harigm
Published on 2010-06-11T10:42:23Z Indexed on 2010/06/11 10:52 UTC
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In my experience I have used many queries like select, order by, where clause etc.. in mysql, sql-server, oracle etc For a moment i have thought,

1)how is this internally written to implement the above queries

2) which language do they use?

3) is that programming language? if yes which language?

4)what kind of environment required to implement this kind of complex database

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