develop-dynamic-sql.md

title	Use dynamic SQL in Synapse SQL
description	Tips for using dynamic SQL in Synapse SQL.
author	filippopovic
ms.author	fipopovi
ms.date	04/15/2020
ms.service	azure-synapse-analytics
ms.subservice	sql
ms.topic	how-to

Dynamic SQL in Synapse SQL

In this article, you'll find tips for using dynamic SQL and developing solutions using Synapse SQL.

Dynamic SQL Example

When developing application code, you may need to use dynamic SQL to help deliver flexible, generic, and modular solutions.

Note

Dedicated SQL pool does not support blob data types at this time. Not supporting blob data types might limit the size of your strings since blob data types include both varchar(max) and nvarchar(max) types. If you have used these types in your application code to build large strings, you need to break the code into chunks and use the EXEC statement instead.

A simple example:

DECLARE @sql_fragment1 VARCHAR(8000)=' SELECT name '
,       @sql_fragment2 VARCHAR(8000)=' FROM sys.system_views '
,       @sql_fragment3 VARCHAR(8000)=' WHERE name like ''%table%''';

EXEC( @sql_fragment1 + @sql_fragment2 + @sql_fragment3);

If the string is short, you can use sp_executesql as normal.

Note

Statements executed as dynamic SQL will still be subject to all T-SQL validation rules.

Next steps

For more development tips, see development overview.