Can Case Be Used In Update Statement?

Can we delete a record using select statement?

The SQL DELETE Query is used to delete the existing records from a table.

You can use the WHERE clause with a DELETE query to delete the selected rows, otherwise all the records would be deleted..

Can subqueries be used in inserts deletes and/or updates?

Subqueries are most frequently used with the SELECT statement, however you can use them within a INSERT , UPDATE , or DELETE statement as well, or inside another subquery.

How do I add a case statement to a select clause?

The CASE statement always goes in the SELECT clause. 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 .

How do you write an update statement?

An SQL UPDATE statement changes the data of one or more records in a table. Either all the rows can be updated, or a subset may be chosen using a condition. The UPDATE statement has the following form: UPDATE table_name SET column_name = value [, column_name = value …]

Can we use CASE statement in where clause?

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.

Can we use case in update statement in Oracle?

Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. … For example, you can use the CASE expression in statements such as SELECT , UPDATE , or DELETE , and in clauses like SELECT , WHERE , HAVING , and ORDDER BY .

Can we write select statement in case?

We can use a Case statement in select queries along with Where, Order By and Group By clause. It can be used in Insert statement as well.

What is CASE statement in SQL?

The SQL CASE Statement The CASE statement 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.

Can we use subquery in update statement?

UPDATE operations with subqueries that reference the same table object are supported only if all of the following conditions are true: The subquery either returns a single row, or else has no correlated column references. The subquery is in the UPDATE statement WHERE clause, using Condition with Subquery syntax.

Can we use subquery in delete statement?

DELETE operations with subqueries that reference the same table object are supported only if all of the following conditions are true: The subquery either returns a single row, or else has no correlated column references. The subquery is in the DELETE statement WHERE clause, using Condition with Subquery syntax.

How do you delete a record in SQL query?

To remove one or more rows in a table:First, you specify the table name where you want to remove data in the DELETE FROM clause.Second, you put a condition in the WHERE clause to specify which rows to remove. If you omit the WHERE clause, the statement will remove all rows in the table.