CTE in SQL Server Examples
In this article we cover what a Common Table Expression CTE is and how to write a CTE for doing selects, inserts, deletes, updates and more.
2021-06-02
In this article we cover what a Common Table Expression CTE is and how to write a CTE for doing selects, inserts, deletes, updates and more.
2021-06-02
As SQL developers, we tend to think of performance tuning in terms of crafting the best table indices, avoiding scalar and table valued functions, and analyzing query plans (among other things). But sometimes going back to the spec and applying some properties of elementary math can be the best way to begin to improve performance of SQL queries which implement mathematical formulas. This article is a case study of how I used this technique to optimize my SQL implementation of the Inverse Simpson Index.
2021-05-07 (first published: 2019-09-12)
5,342 reads
This script features as we can through the CTE Top10FilesWithLargerDiskConsumption the top ten data files that are showing greater consumption of hard drive related data-reading activities.
2019-01-15 (first published: 2019-01-08)
1,016 reads
2018-07-12
1,133 reads
A fun exercise, using CTEs to implement John Conway's Game of Life cellular automata simulation
2018-02-19 (first published: 2015-09-22)
6,515 reads
2015-04-28
1,742 reads
Cursors are considered by many to be the bane of good T-SQL. What are the best ways to avoid iterative T-SQL and to write queries that look and perform beautifully? This first part in an ongoing series of cursor-killing handles inter-row analysis.
2015-12-18 (first published: 2014-05-27)
22,608 reads
2013-09-25
2,967 reads
2013-09-17 (first published: 2013-09-06)
1,438 reads
Finding circular references that are stopping your CTE from working.
2013-09-02 (first published: 2011-01-31)
19,039 reads
By Steve Jones
I love Chicago. I went to visit three times in 2023: a Redgate event,...
By Brian Kelley
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Hi, I have two tables: one for headers with 9 fields and another for...
Let’s consider the following script that can be executed without any error on both SQL Sever and PostgreSQL. We define the table t1 in which we insert three records:
create table t1 (id int primary key, city varchar(50)); insert into t1 values (1, 'Rome'), (2, 'New York'), (3, NULL);If we execute the following query, how will the records be sorted in both environments?
select city from t1 order by city;See possible answers