SQL Server Connector

The SQL Server connector allows querying and creating tables in an external Microsoft SQL Server database. This can be used to join data between different systems like SQL Server and Hive, or between two different SQL Server instances.

Configuration

The connector can query a single database on an SQL server instance. Create a catalog properties file that specifies the SQL server connector by setting the connector.name to sqlserver.

For example, to access a database as sqlserverdb, create the file etc/catalog/sqlserverdb.properties. Replace the connection properties as appropriate for your setup:

connector.name=sqlserver
connection-url=jdbc:sqlserver://<host>:<port>;database=<database>
connection-user=root
connection-password=secret

Multiple SQL Server Databases or Servers

The SQL Server connector can’t access more than one database using a single catalog.

If you have multiple databases, or want to access multiple instances of SQL Server, you need to configure one catalog for each instance.

To add another catalog:

• Add another properties file to etc/catalog

• Save it with a different name that ends in .properties

For example, if you name the property file sales.properties, Presto uses the configured connector to create a catalog named sales.

Querying SQL Server

The SQL Server connector provides access to all schemas visible to the specified user in the configured database. For the following examples, assume the SQL Server catalog is sqlserver.

You can see the available schemas by running SHOW SCHEMAS:

SHOW SCHEMAS FROM sqlserver;

If you have a schema named web, you can view the tables in this schema by running SHOW TABLES:

SHOW TABLES FROM sqlserver.web;

You can see a list of the columns in the clicks table in the web database using either of the following:

DESCRIBE sqlserver.web.clicks;
SHOW COLUMNS FROM sqlserver.web.clicks;

Finally, you can query the clicks table in the web schema:

SELECT * FROM sqlserver.web.clicks;

If you used a different name for your catalog properties file, use that catalog name instead of sqlserver in the above examples.

Pushdown

The connector supports pushdown for processing the following aggregate functions:

• avg()

• count()

• max()

• min()

• sum()

• stddev()

• stddev_pop()

• stddev_samp()

• variance()

• var_pop()

• var_samp()

Limitations

Presto supports connecting to SQL Server 2016, SQL Server 2014, SQL Server 2012 and Azure SQL Database.

Presto supports the following SQL Server data types. The following table shows the mappings between SQL Server and Presto data types.

SQL Server Type	Presto Type
bigint	bigint
smallint	smallint
int	integer
float	double
char(n)	char(n)
varchar(n)	varchar(n)
date	date

Complete list of SQL Server data types.

The following SQL statements are not yet supported:

• DELETE

• GRANT

• REVOKE