Category: SQL Server

Fix Error “Either the parameter @objname is ambiguous or the claimed @objtype (INDEX) is wrong” in SQL Server

Posted on by Ian

If you’re getting SQL Server error Msg 15248 that reads something like “Either the parameter @objname is ambiguous or the claimed @objtype (INDEX) is wrong’“, it appears that you’re trying to perform an operation on an index, but you’ve got the naming syntax slightly wrong. Perhaps you’re trying to rename it.

When we do stuff like rename an index, we need to include the table name when referring to the existing index. It’s possible that you’ve not included this in your code.

To fix this issue, be sure to include the table name.

Continue reading →

What is a Heap in SQL Server?

Posted on by Ian

In SQL Server, a heap is a table without a clustered index. Unlike tables with clustered indexes, which sort data in a specific order, heaps store data in no particular order. That’s because the clustered index is what determines how the table is stored and sorted (it’s sorted on the clustered index’s key column).

If there’s no clustered index, then data is initially stored in the order in which the rows are inserted, although the database engine may change this in order to store the rows more efficiently.

Continue reading →

How to Delete an Index in SQL Server

Posted on by Ian

If you find yourself with an index in SQL Server that you no longer need, you may decide to disable it, or you may opt to get rid of it altogether. That way you can declutter your database, free up space, and perhaps help improve performance of updates to the data.

Typically, to delete an index in SQL Server, we use the DROP INDEX statement. There are cases where we might drop it via other means (for example, if it’s implemented as part of a PRIMARY KEY or UNIQUE constraint – also shown below), but DROP INDEX is usually the go to command for such operations.

Continue reading →

Fix Error 159 “Must specify the table name and index name for the DROP INDEX statement” in SQL Server

Posted on by Ian

If you’re getting SQL Server error 159 that reads “Must specify the table name and index name for the DROP INDEX statement“, it’s probably because you’re trying to drop an index without specifying the table name.

When we drop an index, we must specify both the index name and the table name.

To fix this issue, include both the index name and the table name in your DROP INDEX statement.

Continue reading →

Fix Error 11415 “Object … cannot be disabled or enabled. This action applies only to foreign key and check constraints” in SQL Server

Posted on by Ian

If you’re getting SQL Server error 11415 that reads something like “Object ‘UQ_Employees_Email’ cannot be disabled or enabled. This action applies only to foreign key and check constraints“, it’s probably because you’re trying to disable either a DEFAULT, UNIQUE or PRIMARY KEY constraint.

Continue reading →

Nested WHILE Loops in SQL Server: A Beginner’s Guide with Examples

Posted on by Ian

WHILE loops are a fundamental concept in T-SQL programming, allowing us to execute a block of code repeatedly as long as a specified condition is true. Nested WHILE loops take this concept further by placing one WHILE loop inside another, enabling more complex iterations.

This guide will walk you through the basics of nested WHILE loops in SQL Server, complete with simple examples and a demonstration of the BREAK statement.

Continue reading →

Fix Error 1987 “Cannot alter nonclustered index … because its clustered index is disabled” in SQL Server

Posted on by Ian

If you’re getting SQL Server error 1987 that reads something like “Cannot alter nonclustered index ‘UQ_Employees_Email’ on table ‘Employees’ because its clustered index is disabled“, it’s probably because you’re trying to rebuild a nonclustered index when the clustered index for the table is disabled.

To fix this issue, either enable/rebuild the table’s clustered index first, then try again, or enable all indexes at once.

The clustered index will typically be the primary key index (unless you’ve specified another clustered index for the table).

Continue reading →

What is a Synonym in SQL Server?

Posted on by Ian

In SQL Server, a synonym is a database object that provides an alternative name for another database object, such as a table, view, stored procedure, or function. Synonyms act as aliases, allowing us to reference objects using different names without changing the underlying object itself.

The underlying object that the synonym references is typically referred to the base object. Either way, the synonym allows us to reference the base object without actually referring to its name (we refer to the synonym’s name instead).

Continue reading →