![]() Otherwise, the DECODE function should return date1.Īnswer: To accomplish this, use the DECODE function as follows: DECODE((date1 - date2) - ABS(date1 - date2), 0, date2, date1) If not, the function returns a numeric data type that matches the parameter.Question: One of our viewers wanted to know how to use the DECODE function to compare two dates (ie: date1 and date2), where if date1 > date2, the DECODE function should return date2. The method returns BINARY DOUBLE if the parameter is BINARY FLOAT. The function accepts any numeric or nonnumeric data type as an input, with the ability to implicitly convert to a numeric data type. Only floating-point numbers of the types BINARY FLOAT or BINARY DOUBLE can be used with this function. If the input value n2 is NaN (not a number), this method returns an alternative value n1, and if n2 is not NaN, it returns n2. SQL> select * from sal where LNNVL (NVL (COMMISION_PERCENTAGE, 0) = 0) SQL> select * from sal where NVL (COMMISION_PERCENTAGE, 0) =0 SQL> select * from ipla where LNNVL (sid = 2) The inputs can be int, float, string, character, number, etc. It returns the first NOT NULL input element. The only difference it can accept inputs greater than two. This expression works similar to NVL () expression. This also one of the expression used in SQL. The input types must chosen based on the data types specified. This decode works on the basis of the condition specified.Īny kind of operation specified is going to work here. This Decode expression is used as IF, ELSE IF, ELSE IF Ladder style. This is also one of the expressions used in SQL. ID NAME SAL NVL2(COMMISION_PERCENTAGE,sal,0) WEIRD_SALARY SQL> SELECT id, name, sal, NVL2(COMMISION_PERCENTAGE, sal, 0),Ģ (sal) + (sal * NVL2(COMMISION_PERCENTAGE, NULL, 0.1)) SQL> select NVL2(56.2, 23.4, NULL) from dual SQL> select NVL2(NULL, 23.4, NULL) from dual SQL> select NVL2(NULL, NULL, NULL) from dual SQL> select NVL2(NULL, NULL, 23.4) from dual SQL> select NVL2(NULL, 35.6, 23.4) from dual SQL> select NVL2('Kevin', NULL, ' SA / ENG ') from dual SQL> select NVL2(NULL, 'Pitersen', ' SA / ENG ') from dual SQL> select NVL2('NULL', 'Pitersen', ' SA / ENG ') from dual SQL> select NVL2('Kevin', 'Pitersen', ' SA / ENG ') from dual The input data type can be Integer, Floating Point Number, String, Character input, etc. If both the inputs are NULL, then there is no output for this function. The working of this functioning is as same as NVL () in SQL. The returned value can also be a NULL value too. If the first value is NULL and the second value is NOT NULL, third value is returned. If the first value is NOT NULL, second value is returned. This function returns the first value after NOT NULL value is found, when searched in the function. If input values are more than three then an error is returned. This function can hold three input values only. This is one of the functions of SQL extensively used in Structured Query Language (SQL). ID NAME SAL NVL(COMMISION_PERCENTAGE,0) YEARLY_SALARY ![]() ID NAME SAL NVL(COMMISION_PERCENTAGE,0) MONTHLY_SALARY SQL> SELECT id, name, sal, NVL (COMMISION_PERCENTAGE, 0),Ģ (sal) + (sal * NVL (COMMISION_PERCENTAGE, 0)) SQL> select NVL(COMMISION_PERCENTAGE, 0) from sal SQL> select COMMISION_PERCENTAGE from sal SQL> select NVL('JOE', 'ROOT') from dual ![]() SQL> select NVL(NULL, 1.029384) from dual ![]()
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