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In this article, we will talk about CHECK constraints.

We will see how to add CHECK constraints to SQL Server table columns and discuss the pitfalls you may encounter when using this type of SQL Server constraints.

What is the SQL update syntax to update more than one column?

Answer: The landmark book "Advanced Oracle SQL Tuning The Definitive Reference" is filled with valuable information on Oracle SQL Tuning.

The MERGE statement was included into the set of TSQL statements when SQL Server 2008 was introduced.

Not only does the MERGE statement support the UPSERT concept, but it will also support deleting records.

In order to accomplish this the MERGE statement requires both a Source and Target table.This type of column-based index allows for great performance gains in data warehouses where table scans, rather than seeks, are performed.Column Store indexes have evolved significantly over the last few SQL Server versions: The demand for business intelligence (BI) implementations has never been higher; traditional data warehousing is still a popular method for storing information in a non-relational manner.Their usage is limited to data warehousing tables – typically facts and dimensions modeled in a star or snowflake fashion.By compressing the large amount of column data being returned to the BI client, I/O pressure is significantly lessened.

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