Working with databases

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A database is often something that we cannot do without. And all the database types obey almost the same language... and the problem is "almost" !

[edit] The easy part

A database is an entity (I call it entity just because I do not want to care about the storage, for the moment), which contains different tables, each of them being composed of several columns of any type you want.

You will retrieve data with SQL statements (SQL = Structured Query Language) and believe me when I say than an SQL query can be anything from the most basic query to the most complex one ! At the same time, an SQL query is always "human readable".

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