In SQL, a LEFT OUTER JOIN is a type of JOIN operation that combines data from two tables, based on a JOIN condition. This type of JOIN is called an outer JOIN because it includes not only the matching rows from the tables, but also the rows from the left (or first) table that do not have a matching row …
A LEFT OUTER JOIN with exclusion is a type of JOIN operation in SQL that combines data from two tables, based on a JOIN condition, and excludes the rows that match the JOIN condition. This type of JOIN is called an outer JOIN with exclusion because it includes the rows from the left (or first) table that do not have …
A SQL Server inner join is a type of join that combines records from two or more tables in a database based on the values of the joined columns from each table. Inner joins only return rows that have matching values in the joined columns. In contrast, an outer join will return all rows from one table, and any matching …
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Over the last 30+ years of working with SQL Server, I have seen a lot of interview questions relating to SQL Server. I have been on both sides of the interview table, sometimes wondering what the person on the other side of the table was asking. As a SQL Server developer do you feel that you were asked good questions …
What is your favorite SQL Server Developer Interview questions? Read more »
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When I first created this JOIN Types poster or cheat sheet back in 2013 I didn’t realize there was such a need for it. I originally made this as a tool to explain JOIN types to a fellow coworker. It seemed almost impossible teach JOIN without it. The inspiration to create this tool came from a little bit of frustration. …
Joining tables in SQL Server can be confusing and hinder your performance. I know because I have helped many confused people to understand their JOINs. That is why I created the JOIN Types cheat sheet several years ago, and the JOIN Types class last year. I have recently updated my poster to version 22. I have also made many blog …