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The GROUP BY clause is associated with aggregates. We can filter single or multiple columns out which will affect the data in the results set. The WHERE clause acts like a filter on a list of data that is coming back from tables.
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When joining two tables on a common column, this type of join simply retrieves data that matches in both tables Inner join – this is the default, used if no type is specified.There are three different types of joins: A JOIN is used when we want to pull data from multiple tables. The FROM part of the SELECT statement in SQL is simply used to tell SQL Server from which table should data be fetched. We also use DISTINCT in some cases after SELECT that gives us unique values across the select list. However, if we say order it descending by the quantity that will give us the top ten records by the quantity. So, if we leave it at the default sort order, we’ll get little numbers first. This is usually used with the ORDER BY clause because, for example, if we want to grab top ten sales by quantity, those can be some big numbers. Therefore, try not to select everything, and use specific column names followed by commas that will return only columns based on what’s in the list.įurthermore, a lot of times when there is no column list, we have a keyword TOP followed by a number (n) after the SELECT statement in SQL that returns top (n) records from a table. Let’s just say there are significantly more cons than pros that can be found online using simple research. However, it’s advisable NOT to select everything from tables. If there are multiple tables that we are selecting from, the star will select all columns from all tables e.g.
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It basically means retrieve all the columns from a table. So, SELECT just starts the statement and it’s probably followed by a star (*) AKA “splat”. The syntax of the SELECT statement can be rather complex, but let’s take a brief overview of some of the major keywords used in a SELECT statement, and then we will head over to SQL Server Management Studio to see how the main clauses can be summarized in code. This article is intended for DBAs and developers who want to get familiar with all the major components of the SELECT statement and what this statement is all about. The SELECT statement in SQL is the most used of the DML statements and it’s used for fetching data from tables in SQL Server.