2024-01-17
446 reads
Primary Key (PK)
2024-01-10
504 reads
2023-11-27
3,975 reads
Questions about Primary and Foreign Keys You Were Too Shy to Ask
It is strange that one can ask simple questions about extended events or Hekaton at professional events and conferences without feeling embarrassed, yet nobody likes to ask vital questions about SQL Server primary keys and foreign keys. Fear not, here are 13 questions you were too shy to ask, answered.
2014-10-14
9,933 reads
Why Primary Keys can be important on large tables
I inherited a database that was getting large and not performing well. After adding primary keys life got better.
2014-06-30
14,356 reads
Primary Key Primer for SQL Server
Every database developer uses keys, but without always understanding all the ramifications. They come with few hard and fast rules, but if you get them right from the start with a database design, the whole process of database development is simpler, and the result is likely to perform better. We asked Phil for advice, little knowing that the explanation might take a while.
2013-12-19
5,005 reads
Primary Keys which are not Clustered Indexes in a database
Recently I was asked to find all the Primary keys that are not clustered Indexes in the database. I constructed the below script which will help us to locate the primary keys in the database which are not clustered index.
2013-09-18 (first published: 2013-09-04)
1,909 reads
2013-01-29
2,590 reads
Find Primary Column of all tables in database
This code helps in finding Primary Keys for all tables in a database.
2012-10-02 (first published: 2012-09-04)
1,417 reads
Find gaps in primary keys across multiple databases
Output table of gaps in a primary key across multiple databases on same, remote and/or linked servers.
2012-02-13 (first published: 2011-08-12)
911 reads
Blogs
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Techorama 2024 – Slides
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Forums
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Question of the Day
The "ORDER BY" clause behavior
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