SQL Server has a table-valued function called OPENJSON() that creates a relational view of JSON data.
When you call it, you pass a JSON document as an argument, and OPENJSON() then parses it and returns the JSON document’s objects and properties in a tabular format – as rows and columns.
If you encounter error Msg 208, Level 16 “Invalid object name ‘OPENJSON’.”, you are probably trying to use the OPENJSON() function on a database with a compatibility level of less than 130.
OPENJSON() is only available under compatibility level 130 or higher.
To fix this, either increase the compatibility level of your database to 130 or higher, or change to a database that already has the appropriate compatibility level.
Continue readingIn SQL Server, you can use the ALTER DATABASE statement to change the compatibility level of a database.
This can be useful if you have a database that was created in an earlier version of SQL Server, but you now need to use features that are only available with a later compatibility level.
Continue readingIn SQL Server, you can use the @@ROWCOUNT system function to return the number of rows affected by the last T-SQL statement.
For example, if a query returns 4 rows, @@ROWCOUNT will return 4.
The SQL Server BETWEEN operator allows you to test between a range of values in your queries. For example, you could test that a value is between two numbers.
The BETWEEN operator is inclusive, meaning that it includes the values that you specify within the range. That is, it includes values that are greater than or equal to the lower value, and values that are less than or equal to the higher value. Therefore it’s like using >= and <=.
In SQL Server, the ANSI_NULLS setting allows you to specify how NULL values are treated in queries.
You can use the SESSIONPROPERTY() function to check the ANSI_NULLS setting for the current session.
Below is a list of T-SQL comparison operators that you can use in SQL Server.
Continue readingI was trying to set up a up a linked server from SQL Server to PostgreSQL when I got error Msg 7222, Level 16 “Only a SQL Server provider is allowed on this instance”.
The message is reasonably self explanatory, but it still didn’t tell me what it was about my instance that prevented it from being allowed.
It didn’t take long to find out.
Continue readingWhen you execute a stored procedure that returns a result set in SQL Server, the columns returned are defined in the stored procedure.
But did you know that you can redefine those columns?
What I mean is, you can change the names and/or the data type of the columns returned in the result set.
This could save you from having to fiddle with the column headers and data formats in the event you needed to use that result set in another setting.
For example, if a stored procedure returns a datetime2 column, but you only need the date part, you could specify date for that column, and your result set will only include the date part.
And the best part is that you can do it as part of the EXECUTE statement. No need to massage the data after executing the procedure. way to do this is by using the WITH RESULT SETS clause of the EXECUTE statement.
If you encounter error Msg 11535, Level 16 while trying to execute a stored procedure, it’s because you didn’t define enough result sets in the WITH RESULT SETS clause.
Some stored procedures return multiple result sets. When using the WITH RESULT SETS clause, you need to define each expected result set. You need to do this even if you only want to change the definition of one or some of the result sets.
To fix this error, simply add the additional result sets to the WITH RESULT SETS clause, each separated by a comma.
You could also fix it by removing the WITH RESULT SETS clause, but I’ll assume you’re using it for a reason (i.e. you need to redefine the result set returned by the procedure).