How to use CASE WHEN in Teradata?
Teradata offers “CASE” statement to retrieve/update the results from a column of a table in a different way to promote the end user’s understanding. The CASE functionality must meet END to operate for a table….CASE Statement in Teradata.
| Designation | Salary |
|---|---|
| Software Engineer | 25000 |
| Senior Engineer | 35000 |
| Team manager | 50000 |
How do you write a nested case statement in Teradata?
Nested Case statement in Teradata
- SELECT EmpID,
- CASE.
- WHEN Emp_Type=’Employee’ THEN.
- CASE EmpDesignation.
- WHEN ‘Software Engineer’ THEN 25000+500.
- WHEN ‘Senior Engineer’ THEN 35000+1000.
- WHEN ‘Team manager’ THEN 50000+2000.
- END.
Can we use CASE statement in where clause Teradata?
This check should happen in the where clause . To expand on the excellent answer, you can’t combine case and where in . You’d have to use dynamic sql for that, which macros don’t support, I don’t think. So you have to use this or logic.
Can we use subquery in case statement in Teradata?
Teradata supports Scalar Subqueries only in some special cases within WHERE/HAVING. You’ll have to rewrite it to (Outer) Joins.
What is case Teradata?
Teradata’s CASE statement is used to check for various conditions and in a sequential manner to produce the clustering results based on which conditional is met first.
How do you use case and coalesce in SQL?
The SQL COALESCE function can be syntactically represented using the CASE expression. For example, as we know, the Coalesce function returns the first non-NULL values. SELECT COALESCE (expression1, expression2, expression3) FROM TABLENAME; The above Coalesce SQL statement can be rewritten using the CASE statement.
Can we use subquery in case?
A subquery in the ELSE clause works the same way as a subquery in the THEN clause. We use a passthru predicate to evaluate the subquery conditionally. Similarly, a CASE expression with multiple WHEN clauses with subqueries in each THEN clause also works the same way.
Can you use a select in a Case 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.
What is the syntax of COALESCE in SQL?
Can Case statement return multiple values?
Of course I can write the case condition multiple times, each time return one value. However, as I have many condition need to fit, say 100. It is not good to repeat case condition again and again.
How do you write a multiple Case statement in SQL?
Here are 3 different ways to apply a case statement using SQL:
- (1) For a single condition: CASE WHEN condition_1 THEN result_1 ELSE result_2 END AS new_field_name.
- (2) For multiple conditions using AND: CASE WHEN condition_1 AND condition_2 THEN result_1 ELSE result_2 END AS new_field_name.
What is the syntax for SELECT case?
A Select Case statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each select case.
Which of the following is the syntax for case statement?
Which of the following is correct syntax for CASE statement? Explanation: The CASE statement is started with the keyword CASE followed by any identifier or expression and the IS.
How do you use case and COALESCE in SQL?
What is the difference between COALESCE () & Isnull ()?
Data type determination of the resulting expression is different. ISNULL uses the data type of the first parameter, COALESCE follows the CASE expression rules and returns the data type of value with the highest precedence.