In-depth analysis of the nvl function of Orcale and the isnull function of SQL Server, orcalenvl

In-depth analysis of the nvl function of Orcale and the isnull function of SQL Server, orcalenvl

Nvl function of Orcal

NVL (Expr1, Expr2) If Expr1 is NULL, the value of Expr2 is returned. Otherwise, the value of Expr1 is returned. If both Expr1 and Expr2 are NULL, NULL is returned.

NVL2 (Expr1, Expr2, Expr3) If Expr1 is NULL, the value of Expr2 is returned; otherwise, the value of Expr3 is returned.

NULLIF (Expr1, Expr2) if the values of Expr1 and Expr2 are equal, NULL is returned; otherwise, the value of Expr1 is returned.

Coalesce (expr1, expr2, expr3 ..... Exprn) indicates that placeholders of multiple expressions can be specified. All expressions must be of the same type, or can be implicitly converted to the same type. Returns the first NULL value.

Return Value Type

Numeric, currency, logical, or null

Isnull function of SQL server

ISNULL (check_expression, replacement_value)

Parameters

Check_expression is the expression that will be checked for NULL. Check_expression can be of any type.

Replacement_value returns the expression when check_expression is NULL. Replacement_value must be of the same type as check_expresssion.

Summary

The above section describes the nvl function of Orcale and the isnull function of SQL Server. I hope it will help you. If you have any questions, please leave a message, the editor will reply to you in a timely manner. Thank you very much for your support for the help House website!