Update 'postgres_cpp/README.md'

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Marcin Kostrzewski 2019-04-19 15:20:05 +00:00
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This script requires [libpqxx library](https://www.tutorialspoint.com/postgresql/postgresql_c_cpp.htm).
## Variables in ```#define```
- HOST - address of the MySQL server (IPv4 form),
- HOST - address of your PostgreSQL server (IPv4 form),
- DATABASE - database on the server you wish to operate on,
- SQL - your query.