How do you write a case statement in update query in SQL?

How do you write a CASE statement in SQL update?

CASE statement works like IF-THEN-ELSE statement. I have SQL server Table in which there is column that I wanted to update according to a existing column value that is present in current row. In this scenario, we can use CASE expression. CASE expression is used for selecting or setting a new value from input values.

Can we use CASE statement in update query?

The CASE expression allows a statement to return one of several possible results, depending on which of several condition tests evaluates to TRUE. You must include at least one WHEN clause within the CASE expression; subsequent WHEN clauses and the ELSE clause are optional.

How write if else in update query in SQL Server?

IF @flag = 1 UPDATE table_name SET column_A = column_A + @new_value WHERE ID = @ID; ELSE UPDATE table_name SET column_B = column_B + @new_value WHERE ID = @ID; This is much easier to read albeit this is a very simple query. Here’s a working example courtesy of @snyder: SqlFiddle.

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Where do you put case statements in SQL?

According to MS SQL Docs, a CASE statement can be used throughout the SELECT statement. CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as select_list, IN, WHERE, ORDER BY, and HAVING.

How do you write a Case statement in SQL query?

SQL CASE Statement

  1. CASE. WHEN condition1 THEN result1. WHEN condition2 THEN result2. WHEN conditionN THEN resultN. ELSE result. …
  2. Example. SELECT OrderID, Quantity, CASE. WHEN Quantity > 30 THEN ‘The quantity is greater than 30’ …
  3. Example. SELECT CustomerName, City, Country. FROM Customers. ORDER BY.

Can we use SET IN Case statement in SQL?

It uses IIF to set TrendValue to 0 when the divider is equal to 0. The CTE gets all rows from your table and calculate the 3 trend values. You can then SELECT from it or UPDATE the columns from the main table used in the CTE. This works like an UPDATE in a VIEW.

How do you write a Case statement?

Gather the following:

  1. your mission statement and all other strategic materials (strategic plan, vision statement, etc.)
  2. your financial data (financial statements, fund usage, gaps, etc.)
  3. program analysis, reports, etc. …
  4. program dreams (don’t limit yourself to materials wish lists, think of these as broader than that)

How do you write multiple cases in SQL?

SELECT (case A. column1 when ‘1’ then (select value from B where B. clientId=100 and ‘1’=B.Id) when ‘2’ then (select value from C where C.

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What is a Case statement in programming?

A case or switch statement is a type of selection control mechanism used to allow the value of a variable or expression to change the control flow of program execution via a multiway branch.

Can you use or in SQL?

The OR condition can be used in the SQL UPDATE statement to test for multiple conditions. This example would update all favorite_website values in the customers table to where the customer_id is 5000 or the last_name is Reynolds or the first_name is Paige.

How do you add an if else condition in SQL query?

An optional extra is to add a column name to our result.

  1. case when condition1 then result1 when condition2 then result2 when condition3 then result3 else result end as columnname;
  2. select game, year, case when game like ‘sonic%’ then ‘Y’ else ‘N’ end as ‘Sonic Series’ from sega_sales order by ‘Sonic Series’ desc.

How do I add an IF condition in SQL query?

You can use CASE to implement IF-THEN-ELSE in PL/SQL – this is just an example: select case field1 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END, case field2 WHEN ‘1’ THEN ‘VALUE1’ WHEN ‘2’ THEN ‘VALUE2’ ELSE ‘VALUEOTHER’ END from ( select ‘1’ “FIELD1”, ‘2’ “FIELD2” from dual );

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