LCK_M*—This wait type happens when a query locks an object while another query is waiting to lock the same object. A common scenario is when a query is trying to modify a row while another query is ...

SQL data types. To learn more about SQL data types, read “SQL basics: String data types,” which covers general data-type usage and describes using the various string data types, and “SQL ...

I added a table to the Chinook database that contained a column of each of the SQL Server data types to ensure that each would be generated correctly. Listing 3 shows the T-SQL script to create the ...

It’s sometimes difficult to know which SQL syntax to use when combining data that spans multiple tables. SQL provides several different statements for performing this type of task; knowing which ...

A few years ago, teams had to write SQL queries and code to extract useful information from large swathes of data. Today, all they have to do is type in a question.

As an example, SQL was the first programming language to return multiple rows per single request. This makes it easier to get data on what is taking place within a set of data—and consequently ...