How do you write Nullif in SQL?

Posted on by Drake Andrew

How do you write Nullif in SQL?

  1. Syntax. syntaxsql Copy. NULLIF ( expression , expression )
  2. Arguments. expression.
  3. Return Types. Returns the same type as the first expression.
  4. Remarks. NULLIF is equivalent to a searched CASE expression in which the two expressions are equal and the resulting expression is NULL.
  5. Examples. A.
  6. See Also. CASE (Transact-SQL)

How do you use the Nullif function?

The MySQL NULLIF() function is used for the comparison of two expressions. The NULLIF() function returns NULL if both the expressions are equal, else it returns the first expression. The NULLIF() function accepts the expressions as parameter and returns NULL if both of them are equal.

What does Nullif function do in SQL?

The NULLIF() function returns NULL if two expressions are equal, otherwise it returns the first expression.

Is NULL and Nullif?

NULLIF is equivalent to a searched CASE function in which the two expressions are equal and the resulting expression is NULL. Replaces NULL with the specified replacement value.

What is Nullif Oracle?

The NULLIF function is very similar to the CASE expression. It returns NULL if the two arguments are equal, and it returns the first argument if they are not equal.

What is SQL coalesce?

The SQL Coalesce and IsNull functions are used to handle NULL values. During the expression evaluation process the NULL values are replaced with the user-defined value. The SQL Coalesce function evaluates the arguments in order and always returns first non-null value from the defined argument list.

What is Nullif in MySQL?

The NULLIF() function compares two expressions and returns NULL if they are equal. Otherwise, the first expression is returned.

What is true about the coalesce function?

The COALESCE function returns the first non-NULL value from a series of expressions. The expressions are evaluated in the order in which they are specified, and the result of the function is the first value that is not null. The result of the COALESCE function returns NULL only if all the arguments are null.

What is the difference between Isnull and Nullif in SQL?

ISNULL and NULLIF are exactly opposite to each other. ISNULL returns NULL if comparison becomes successful. On the other hand, NULLIF returns not null if comparison becomes successful.

What is true about the Nullif function in Oracle DB?

The Oracle NULLIF() function accepts two arguments. It returns a null value if the two arguments are equal. In case the arguments are not equal, the NULLIF() function returns the first argument. In this syntax, the e1 cannot be a literal NULL.

What is true about the Nullif function in Oracle DB *?

The Oracle/PLSQL NULLIF function compares expr1 and expr2. If expr1 and expr2 are equal, the NULLIF function returns NULL. Otherwise, it returns expr1.

Why we use coalesce in SQL?