Frequent question: How do you do multiple if statements in SQL?

How do you write multiple if conditions in SQL?

END TRY BEGIN CATCH SELECT ERROR_MESSAGE() AS ‘Message’ RETURN -1 END CATCH END –The above works I then insert this below and these if statement become nested—- IF(@A!= @SA) BEGIN exec Store procedure @FIELD = 15, … more params… END IF(@S!= @SS) BEGIN exec Store procedure @FIELD = 10, … more params…

Can you have multiple from statements SQL?

It’s sometimes difficult to know which SQL syntax to use when combining data that spans multiple tables. … A simple SELECT statement is the most basic way to query multiple tables. You can call more than one table in the FROM clause to combine results from multiple tables.

How many else if can I use in SQL?

2 Answers. Yes, they are the same. Only one condition will be executed and the order of conditions is crucial.

CAN YOU DO IF statements in SQL?

IF statements can be used to conditionally enter into some logic based on the status of a condition being satisfied. The IF statement supports the use of optional ELSE IF clauses and a default ELSE clause. … An END IF clause is required to indicate the end of the statement.

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How many else clauses can an if statement have?

When you want to define more than two blocks of statements, use the ElseIf Statement. You can nest up to ten levels of If… Then… Else statements. If you need to create an expression with more than ten levels, you must redefine it using the ElseIf statement or the Select Case…

How do I combine results of two SQL queries?

Procedure

  1. To combine two or more SELECT statements to form a single result table, use the set operators: UNION, EXCEPT or INTERSECT. …
  2. To keep all duplicate rows when combining result tables, specify the ALL keyword with the set operator clause.

How do I have multiple rows in one row in SQL?

STUFF Function in SQL Server

  1. Create a database.
  2. Create 2 tables as in the following.
  3. Execute this SQL Query to get the student courseIds separated by a comma. USE StudentCourseDB. SELECT StudentID, CourseIDs=STUFF. ( ( SELECT DISTINCT ‘, ‘ + CAST(CourseID AS VARCHAR(MAX)) FROM StudentCourses t2.

How do I run two SQL queries?

In this step, you create the union query by copying and pasting the SQL statements.

  1. On the Create tab, in the Queries group, click Query Design.
  2. On the Design tab, in the Query group, click Union. …
  3. Click the tab for the first select query that you want to combine in the union query.

How do you run an IF condition?

The IF statement evaluates the given conditional expression. If the result is true (i.e. nonzero), then the statements following the <IF> tag are executed. If the result is false, those statements are skipped and control falls to the next statement after the closing </IF> tag.

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Will if evaluate to TRUE?

If the boolean expression evaluates to TRUE, then the block of statement(s) inside the if statement is executed. If boolean expression evaluates to FALSE, then the first set of code after the end of the if statement(s) is executed.

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