Postgres-XC 1.1 Documentation
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# 3.1. Introduction

> Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly.

In the previous chapter we have covered the basics of using SQL to store and access your data in Postgres-XC. We will now discuss some more advanced features of SQL that simplify management and prevent loss or corruption of your data. Finally, we will look at some Postgres-XC extensions.

This chapter will on occasion refer to examples found in Chapter 2 to change or improve them, so it will be useful to have read that chapter. Some examples from this chapter can also be found in `advanced.sql` in the tutorial directory. This file also contains some sample data to load, which is not repeated here. (Refer to Section 2.1 for how to use the file.)

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