Can we use alias name in case statement?

Can we use alias name in case statement?

The Case statement in SQL is mostly used in a case with equality expressions. Another way to do aliases is to put the name of the alias first followed by equals SQL Case on “MaritalStatus” as in the example above. …

How do I name an alias in query?

SQL aliases are used to give a table, or a column in a table, a temporary name. Aliases are often used to make column names more readable. An alias only exists for the duration of that query. An alias is created with the AS keyword.

How do I use alias in SQL Select statement?

Alias Facts

  1. An alias only temporary renames the column or table name, it lasts for the duration of select query. The changes to the names are not permanent.
  2. This technique of creating alias is generally used by DBA (Database Administrators) or Database users.
  3. The temporary table name is also called correlation name.

Can we use alias name in where clause in SQL Server?

In PROC SQL, a column alias can be used in a WHERE clause, ON clause, GROUP BY clause, HAVING clause, or ORDER BY clause.

Can we use case in 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.

What is the correct syntax for exists expression?

The result of EXISTS is a boolean value True or False. It can be used in a SELECT, UPDATE, INSERT or DELETE statement. Syntax: SELECT column_name(s) FROM table_name WHERE EXISTS (SELECT column_name(s) FROM table_name WHERE condition);

How do I SELECT a name in SQL?

The SQL SELECT Statement

  1. SELECT column1, column2, FROM table_name;
  2. SELECT * FROM table_name;
  3. Example. SELECT CustomerName, City FROM Customers;
  4. Example. SELECT * FROM Customers;

How do you write a select query in a case statement?

insert into table table_name ( value1, value 2,value 3) select (value 1,value2 , case value3 when value1 = ‘somevalue’ &&* value2 = ‘somevalue’ then ‘x’ else ‘y’ End from table_name.

How to use the column name alias from a case statement?

Look up the order in which the clauses in a select statement are executed in SQL. The actual SELECT list is the last one performed, so your alias doesn’t exist while the other clauses are being executed. You can do some nesting (subqueries, CTE, etc.) to materialize the results you want.

How to assign column alias in SQL Server?

In SQL Server, there is a way to assign a usable column alias, using CROSS APPLY: You can even embed / stack CROSS APPLY alias references, for example:

Can you set an alias in the SELECT clause?

You cannot, at the same time, set and access an alias in the SELECT clause. I would suggest rewriting your query using CROSS APPLY: SELECT t1. [RegFinish], t2.

Can you reference an alias in the same query?

The main issue is you cannot reference an alias in the same query. Also you have parentheses and an extra SELECT keyword, making what looks like a subquery where I don’t believe you intended one (you do not have a FROM clause).

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