---
title: "Introduction"
slug: "introduction-to-sql"
updated: 2024-01-17T12:56:31Z
published: 2024-01-17T12:56:31Z
canonical: "help.mail-and-deploy.com/introduction-to-sql"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.mail-and-deploy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction to SQL

### General

SQL datasources can be used to directly connect SQL databases to Mail & Deploy. The following SQL datasources are supported:

- [Microsoft SQL Server Databases](/version340/docs/microsoft-sql-server-databases)
- [MySQL Databases](/version340/docs/mysql-databases)
- [Oracle Databases](/version340/docs/oracle-databases)

### Considerations

When rebuilding the cache of an SQL datasource, Mail & Deploy will collect all tables, views, and their columns. When filtering the data model (i.e. using a [Filter Datasource Field Action](/version340/docs/filter-datasource-field)) the filter will only be applied to the view or table to which to the filtered field belongs. Mail & Deploy will not automatically filter related (i.e. by foreign keys) tables or views.