While SQL is inherently a declarative language, meaning it focuses on what data to retrieve, rather than how to retrieve it, there are scenarios where we might need to perform iterative operations. SQL provides a few methods to help us loop through records in database management systems likeMyS...
I do not prefer to use cursors as they are slow and will impact performance. As a good practice I always try not to use cursors in my sql code. But, how to loop through table rows without
You can use a WHILE Statement in a batch,stored procedure,a trigger,or a cursor to allow a set of T-SQL statement to execute repeatedly as long as the given condition holds true. SYNTAX: WHILE boolean_expression {sql_statement|statement_block} ...
"Object is currently in use elsewhere" error for picturebox "Parameter is not valid" - new Bitmap() "Recursive write lock acquisitions not allowed in this mode.? "Settings" in DLL project properties and app.config file "The function evaluation requires all threads to run" while accessing...
After INSERT Trigger question - how to use value from last added record Age Bucket in sql Age calculation in report builder query Aggregated CASE expressions versus the PIVOT operator… Is one better than the other? Aging Report SQL Query Alias all columns in a given table Alias column with ...
This post demonstrates the process to use the exit statement to terminate a loop in PostgreSQL. PL/pgSQL Exit Statement: How to Terminate a Loop The EXIT statement can be used to terminate the body of the loop before the actual ending of the loop by providing some conditions to this statem...
Using SQL AVG with GROUP BY The last two queries used the WHERE clause to filter the rows we are plan to use the AVG function on. In one query, we filtered the results by a result from the AVG function. In the second, we used WHERE to filter the results that it will use to gener...
This chapter is a basic tour of the kernel-provided device infrastructure in a functioning Linux system. 本章是对Linux系统中内核提供的设备基础架构的基本介绍。 Throughout the history of Linux, there have been many changes to how the kernel presents devices to the user. We’ll begin by looking...
It allows us to force the SQL Server query optimizer to select parallel plan instead of serial plan. We will use ENABLE_PARALLEL_PLAN_PREFERENCE in this query and the Query Optimizer will generate a parallel plan. Parallel execution plan with “ENABLE_PARALLEL_PLAN_PREFERENCE” query hint ...
There are multiple ways to concatenate strings in C#. Learn the options and the reasons behind different choices.