SQL Server IF ELSE Statement By Examples.

The SQL If Else statement is one of the most useful decision-making statements. SQL If statement will test the condition first, and depending upon the result, it will execute the statements. If the test condition in SQL If statement is true, the statements inside the if block will execute. Otherwise, statements inside the Else block executed.

Definition and Usage The IF () function returns a value if a condition is TRUE, or another value if a condition is FALSE.

SQL IF THEN: Learn the Various Forms the IF-THEN Statement.

Is any Transact-SQL statement or statement grouping as defined by using a statement block. Unless a statement block is used, the IF or ELSE condition can affect the performance of only one Transact-SQL statement. To define a statement block, use the control-of-flow keywords BEGIN and END.This SQL Server tutorial explains how to use the IF.ELSE statement in SQL Server (Transact-SQL) with syntax and examples. In SQL Server, the IF.ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.The basic syntax of IF THEN statement is as follows. IF ( condition ) THEN statement END IF; Note that the conditionals, and other statements, are written in all caps, in SQL. With the IF statement, we first check a condition. If it evaluates to true, the statement associated with THEN is executed.


The simplest form of IF statement associates a Boolean expression with a sequence of statements enclosed by the keywords THEN and END IF. The sequence of statements is executed only if the expression returns TRUE. If the expression returns FALSE or NULL, the IF statement does nothing. In either case, control passes to the next statement.Since in real-life projects SQL queries are hardly one-liners, learning the right way to write a SQL query makes a lot of difference when you read it yourself later or you share that query to.

Writing SQL Queries. What might not have become clear from the previous section is that the Garbage In, Garbage Out (GIGO) principle naturally surfaces within the query processing and execution: the one who formulates the query also holds the keys to the performance of your SQL queries.

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The SQL INSERT INTO Statement is used to add new rows of data to a table in the database. Syntax There are two basic syntaxes of the INSERT INTO statement which are shown below.

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Summary: in this tutorial, you will learn how to use MySQL IF statement to execute a block of SQL code based on a specified condition. Note that MySQL has an IF() function that is different from the IF statement described in this tutorial. The IF statement has three forms: simple IF-THEN statement, IF-THEN-ELSE statement, and IF-THEN-ELSEIF- ELSE statement.

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SQL also doesn’t pay any attention to the end of the line. You can start a new line at any point in the SQL statement or write the entire statement on one line. Quotes: Notice that CA and Fresno are enclosed in double quotes (“) in the preceding query.

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SQL SELECT statement is used to query or retrieve data from a table in the database. A query may retrieve information from specified columns or from all of the columns in the table. To create a simple SQL SELECT Statement, you must specify the column(s) name and the table name. The whole query is called SQL SELECT Statement.

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Subqueries can be applied in many ways. Nevertheless, the main idea is the same. Side note: You can see how to load the databases we are using, in the linked tutorial. A Case in Point. Most often, SQL subqueries are employed in the WHERE clause of a SELECT statement. Let’s see what will happen after we run the following code.

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The IF statement is used to execute a block of code if a condition is satisfied. If a condition is not satisfied (FALSE) then optionally ELSE statement can be used. In the case of SQL Server, the IF statement is used to execute SQL statements if a condition is TRUE.

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SQL Query to Select All If Parameter is Empty or NULL In this example, we used the IIF Function along with ISNULL. First, the ISNULL function checks whether the parameter value is NULL or not. If True, it will replace the value with Empty string or Blank.

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Writing SQL statements in the Query Designer component of the Microsoft SQL Server Management Studio provides a graphical interface for writing queries. You can create a new query or copy a query from an existing Configuration Manager report, paste the SQL statement into the SQL pane of the Query Designer, and easily add views, create joins, select columns to display, add criteria, sort data.

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When you're given complex SQL queries to write which involve joins across many tables and several nested conditions, then it can seem a little intimidating, especially if you're not too confident or experienced with SQL syntax. This article shows you how to write a complex SQL query by breaking it down into simple steps and building it back up from there.

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