How can use multiple Then in CASE statement in SQL?
You have to repeat your case construct for each column name. Something like this: case ColumnName when ‘A’ then ‘Apple’ when ‘B’ then ‘Banana’ end ColumnName, case ColumnName when ‘A’ then ‘1’ when ‘B’ then ‘2’ end ExtraColumn, There is a gotcha here.
Can a CASE statement have multiple conditions?
Multiple conditions in CASE statement
You can evaluate multiple conditions in the CASE statement.
Can CASE statement return multiple values?
@yzhang – With CASE only the first match will return values. If you want the possibility of multiple conditions mathcing each input row, you need to make each check indpendantly, and UNION the results together.
Can we use aggregate function in CASE statement?
CASE statement in SQL and aggregate functions
Aggregate functions in SQL Server perform calculations and return a single value. Examples of aggregate functions are MIN, MAX, COUNT, ABG and CHECKSUM. For this purpose, we use the COUNT aggregate function in SQL Server.
How do you write or condition in a CASE statement in SQL?
SQL Case Statement Syntax
Then for a single condition you can write the keyword WHEN followed by the condition that has to be satisfied. After that comes the keyword THEN and the value for that condition, like WHEN <condition> THEN <stuff> . This can then be followed by other WHEN / THEN statements.
Can we use and condition in CASE statement in SQL?
CASE must include the following components: WHEN , THEN , and END . ELSE is an optional component. You can make any conditional statement using any conditional operator (like WHERE ) between WHEN and THEN . This includes stringing together multiple conditional statements using AND and OR .
What are the two types of case expressions?
The CASE expression is a conditional expression, similar to if/then/else statements found in other languages. CASE is used to specify a result when there are multiple conditions. There are two types of CASE expressions: simple and searched.
Can you use a subquery in a Case Statement?
Takeaway: Do not use a subquery as a condition in the CASE expression. If you need to retrieve a value, put the result of the subquery in a variable first. Then, use that variable in the CASE expression.
How do you write an IF THEN statement in SQL?
Syntax. IF (a <= 20) THEN c:= c+1; END IF; If the Boolean expression condition evaluates to true, then the block of code inside the if statement will be executed. If the Boolean expression evaluates to false, then the first set of code after the end of the if statement (after the closing end if) will be executed.
Can we use two columns in CASE statement in SQL?
Yes, you can evaluate different columns in the CASE statement.
How do I apply GROUP BY condition?
Syntax: SELECT column1, function_name(column2) FROM table_name WHERE condition GROUP BY column1, column2 HAVING condition ORDER BY column1, column2; function_name: Name of the function used for example, SUM() , AVG(). table_name: Name of the table. condition: Condition used.
Can we use or condition in case?
It is practically not possible to use OR statement in CASE statement as the structure of the CASE statement is very different.
Can we use or in case?
The switch-case construct is pretty similar to an if-else statement, you can use the OR operator in an if however.
What is CASE statement syntax?
The SQL CASE Expression
The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else 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.
What is simple CASE statement?
The simple CASE statement evaluates a single expression and compares it to several potential values. The searched CASE statement evaluates multiple Boolean expressions and chooses the first one whose value is TRUE .
What can we use instead of case in SQL?
Question: What is Alternative to CASE Statement in SQL Server? Answer: IIF Function.
Can CASE statement return multiple values in Oracle?
A CASE statement cannot return more than one value, it is a function working on one value.
Can I use if condition in SQL query?
Any T-SQL statement can be executed conditionally using IF… ELSE. If the condition evaluates to True, then T-SQL statements followed by IF condition in SQL server will be executed. If the condition evaluates to False, then T-SQL statements followed by ELSE keyword will be executed.
How do I find duplicate values in SQL?
How to Find Duplicate Values in SQL
- Using the GROUP BY clause to group all rows by the target column(s) – i.e. the column(s) you want to check for duplicate values on.
- Using the COUNT function in the HAVING clause to check if any of the groups have more than 1 entry; those would be the duplicate values.
How set multiple values in SQL?
To update multiple columns use the SET clause to specify additional columns. Just like with the single columns you specify a column and its new value, then another set of column and values. In this case each column is separated with a column.
How do I select multiple columns based on condition in SQL?
When we have to select multiple columns along with some condition, we put a WHERE clause and write our condition inside that clause. It is not mandatory to choose the WHERE clause there can be multiple options to put conditions depending on the query asked but most conditions are satisfied with the WHERE clause.
Can we GROUP BY 2 columns in SQL?
SELECT Statement: The GROUP BY Clause in SQL
A GROUP BY clause can contain two or more columns—or, in other words, a grouping can consist of two or more columns.
Can we use multiple GROUP BY in SQL?
We can use the group by multiple column technique to group multiple records into a single record. All the records that have the same values for the respective columns mentioned in the grouping criteria can be grouped as a single column using the group by multiple column technique.
How do you write a case statement with or condition in SQL?
Can I use in case and if together?
We can use if and in case to talk about future possibilities. If is about what might happen. In case is about precautions that we take now to avoid problems in the future. See examples and learn the difference in this video.