2024-12-06
610 reads
Subquery
Three Use Case Examples for SQL Subqueries
There are many great tutorials on syntax, performance, and keywords for invoking subqueries. However, I wish to discover a tip highlighting selected SQL subquery use cases. Please briefly describe three SQL subquery use case examples. For each use case, cover how a subquery interacts with outer queries and the T-SQL for implementing the use case. Review excerpts from each example to show the value of implementing the use case.
2023-04-14
2019-11-08
1,128 reads
SQL Server Subquery in Select Statement with Where Clause
In this part of the temporary data store tip series we look at using subqueries to select data as well as how to use for inserts, updates and deletes.
2019-05-22
Stairway to T-SQL: Beyond The Basics Level 3: Building a Correlated Subquery
This stairway level will expand on the subquery topic by discussing a type of subquery known as a correlated subquery, and explores what a correlated subquery is and how it is different from a normal subquery.
2019-05-08 (first published: 2014-03-05)
20,457 reads
2013-05-09
2,226 reads
2013-03-08
2,353 reads
2013-01-11
2,708 reads
2011-09-19
3,075 reads
Blogs
Securing Kubernetes With External Secrets Operator on AWS
Here’s a way to centralize management, rotate secrets conveniently without downtime, automate synchronization and...
Save Azure PostgreSQL Backup to Storage
This may or may not be helpful in the long term, but since I’m...
The Book of Redgate: What’s Great about Redgate?
By Steve Jones
“I’m sick of hearing about Red Gate.” The first article in the book has...
Forums
Dynamic T-SQL Script Parameterization Using Python
Comments posted to this topic are about the item Dynamic T-SQL Script Parameterization Using...
Collation related issues
I have read that the collation at the instance level cannot be changed. I...
getting started paas SSAS
hi our on prem STD implementation of SSAS currently occupies about 3.6 gig of...
Question of the Day
Multiple Sequences
In SQL Server 2022, I run this code:
CREATE SEQUENCE myseqtest START WITH 1 INCREMENT BY 1; GO CREATE TABLE NewMonthSales (SaleID INT , SecondID int , saleyear INT , salemonth TINYINT , currSales NUMERIC(10, 2)); GO INSERT dbo.NewMonthSales (SaleID, SecondID, saleyear, salemonth, currSales) SELECT NEXT VALUE FOR myseqtest , NEXT VALUE FOR myseqtest , ms.saleyear , ms.salemonth , ms.currMonthSales FROM dbo.MonthSales AS ms; GO SELECT * FROM dbo.NewMonthSales AS nmsAssume the dbo.MonthSales table exists. If I run this, what happens? See possible answers