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make edits requested by divayprakash

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https://github.com/adambard/learnxinyminutes-docs/pull/3349
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language: SQL
filename: learnsql.sql
contributors:
- ["Bob DuCharme", "http://bobdc.com/"]
lang: en-en
- ["Bob DuCharme", "http://bobdc.com/"]
https://github.com/adambard/learnxinyminutes-docs
---
Structured Query Language (SQL) is an ISO standard language for creating and working with databases stored in a set of tables. Implementations usually add their own extensions to the language; [Comparison of different SQL implementations](http://troels.arvin.dk/db/rdbms/) is a good reference on product differences.
@ -13,7 +13,7 @@ Implementations typically provide a command line prompt where you can enter the
Several of these sample commands assume that the [MySQL employee sample database](https://dev.mysql.com/doc/employee/en/) available on [github](https://github.com/datacharmer/test_db) has already been loaded. The github files are scripts of commands, similar to the relevant commands below, that create and populate tables of data about a fictional company’s employees. The syntax for running these scripts will depend on the SQL implementation you are using. A utility that you run from the operating system prompt is typical.
```
```sql
# Comments start with a pound sign. End each command with a semicolon.
# SQL is not case-sensitive about keywords. The sample commands here