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What's SQL?

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QL stands for Structured Query Language. SQL is the language for talking to relational databases. It's been used by millions of people, since 1986 and provides the user with CRUD functionality. The user can Create data in a database, Read it, Update it, and Delete it.

SQL is a cornerstone of data processing and by extension, the modern business world. Its usefulness means you'll meet many SQL users who don't have the word data, in their job title.

A SQL query to access rows of data follows a predictable format.

SELECT, request a column of tabular data

FROM, specifies the table to access

WHERE, sets conditions for inclusion

GROUP BY, aggregates the resulting rows into groups. 

And ORDER BY and LIMIT, determine how the data is ordered and limited, and count.

All the commands after the second line are optional. But when present, they are always in that order. And these are just the basics.

SQL also provides some simple mathematical functions out of the box, average, min, max, sum, count, and several trigonometric functions.

It can also be configured to access more complex, machine-learning algorithms and predictive models.

But that's not native to SQL itself.

The analysis we can perform inside SQL itself is somewhat limited in that way. However limited, It's a dependable workhorse. You can save and reuse a good query indefinitely, using it as a single source of truth for a particular question. That means SQL can give you fresh data in a consistent format. 

Since its introduction, many sub-languages of SQL have been introduced. These add features for convenience, security, distributed computing, and more. Once you learn the basics of SQL, it's not too hard to learn another SQL sub-language like MySQL or Postgres.

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