Question

Which operator is used to check for existence of a value ? O EXISTS O WHERE O IN OAS​

Answer 1

Answer:

The 'in' operator is used to check if a value exists in a sequence or not. ... 'not in' operator- Evaluates to true if it does not finds a variable in the specified sequence and false otherwise.

Answer 2

Answer:

The EXISTS operator is used to test for the existence of any record in a subquery. The EXISTS operator returns TRUE if the subquery returns one or more records.

Explanation:

Step 1: A value is compared to a list of literal values that have been supplied using the IN operator. When utilising wildcard operators to compare two values, the LIKE operator is employed. When used with another logical operator, the NOT operator flips the meaning of that operator.

Step 2: JavaScript's "==" operator compares two values on both sides and returns true or false. It is sometimes referred to as the "loose equality operator" in Javascript. This operator only verifies equality after type coercing both values to the same type.

Step 3: A logical operator called SQL EXISTS is used to determine if any given record in a database already exists. If the subquery produces one or more records, it returns TRUE. In contrast to the EXISTS operator, SQL NOT EXISTS is fulfilled if no rows are returned by the subquery.

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