Then statement sql

With the IF statement , we first check a condition. If it evaluates to true, the statement associated with THEN is executed. Is any Transact- SQL statement or statement grouping as defined by using a statement block. Unless a statement block is use 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. OR is not supported with CASE Statement in SQL. Learn how to use IF… THEN logic in SQL Server, which allows users to execute programmatic logic on values within a query in real-time. The SQL CASE Statement.

So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause. If there is no ELSE part and no conditions are true, it returns NULL. SQL Server allows for only levels of nesting in CASE expressions. For a list of control-of-flow methods, see Control-of-Flow Language (Transact- SQL ). SQL If statement will test the condition first and depending upon the result it will execute the statements.

What is the use of GO statement in SQL statements? What are the types of SQL statement? How to combine multiple selects in one query? Where statement in SQL query? Données Visuelles Sans Ecrire Une Ligne De Code.

Because of this pairing, you might be tempted to call this SQL CASE WHEN, but CASE is the accepted term. Every CASE statement must end with the END statement. ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE.

It is an extension to the If then Else (which we discussed in the earlier post). If Else statement will only execute the statements when the given condition is either true or False but in real worl we may have to check. This is the second form of the IF statement.

Below is the syntax of the IF-ELSE statement. This SQL tutorial explains how to use the AND condition and the OR condition together in a single query with syntax and examples. A statement block is a series of SQL statements that run together. Learn more about this powerful statement in this article.

If the condition evaluates to TRUE, the statements after the THEN execute. Otherwise, the IF statement does nothing. In the following example, the statements between THEN and END IF execute because the sales revenue is greater than 10000. SQL also has decision making statements.

As I set the value of the variable as orders, the IF statement should return the records from sto_orders table. In the code, you can see the third IF statement is started after the second BEGIN keyword. Note: If you want to use conditional execution in the SELECT statement then use the CASE statement in SQL.

What it basically means is that we can do Case followed by the field name and then we can have all case expressions. In this particular case, whenever “Gender” equals “F” then it’s going to output “Female” and when it equals “M” then it’s going to output “Male”. Specifies the label for the IF statement.

For additional information, see References to labels. They are shown as green in the diagram. If you want to synchronize the target table with the data from the source table, then you will need to use this match condition to delete rows from the target table.

Suppose we have two table sales. An IF- THEN statement can be followed by an optional ELSIF. Today we will learn about Nested Case Statement in SQL Server.

We can nest CASE statements similar to nested ifs that we find in most programming languages.