NVL(expression, default_value)。 The expression parameter is the value that you want to check for NULL. If the expression is NULL, then the default_value parameter will be returned. For example, the following query uses the NVL function to replace NULL values in the "name" column with the...
The NVL2 function is similar to the NVL function. NVL2 allows you to specify a value to check, and then specify a value to use if it is null, as well as a value to use if it is not null. It’s similar to NVL because NVL allows you to check a value and return something else i...
To be clear, if i need to apply this NVL function to more than one column like this: NVL(column1;column2 ... , here is the default value for all ) Answer: You will need to make separate NVL function calls for each column. For example: select NVL(table_name, 'not found'), NVL(...
To be clear, if i need to apply this NVL function to more than one column like this: NVL(column1;column2 ... , here is the default value for all ) Answer: You will need to make separate NVL function calls for each column. For example: select NVL(table_name, 'not found'), NVL(...
SELECT translate('我是中国人,我爱中国', '中国', 'China') "Translate example" FROM dual; 5、通用函数 If –then–else 逻辑 31、 nvl(value,str)函数 如果第一个参数不是null,返回的就是第一个参数,如果第一个为null,就返回第二个参数
The MS AccessIsNull()function returns TRUE (-1) if the expression is a null value, otherwise FALSE (0): SELECTProductName, UnitPrice * (UnitsInStock + IIF(IsNull(UnitsOnOrder),0, UnitsOnOrder)) FROMProducts; Oracle The OracleNVL()function achieves the same result: ...
Example of DECODE and NVL functions SELECT STATE, DECODE(STATE,'HI', 'Remote US state', 'AK', 'Continental US state', 'Contiguous US state') LOCATION FROM CUSTOMER The column the DECODE function examines is named STATE Explanation of an example of the DECODE function The column the DE...
nvl(s.username, ''[Oracle process]'') user_name, s.terminal terminal, s.program program, st.value criteria_value from v$sesstat st, v$session s , v$process p where st.sid = s.sid and st.statistic# = to_number(''38'') and (''ALL'' = ''ALL'' or s.status = ''ALL'') ...
NVL(expression, substitute_value) TheNVLfunction evaluates 'expression' and returns 'substitute_value' if 'expression' is null; otherwise, it returns the value of 'expression' itself. For example: Consider a scenario where you're analyzing inventory data, including item quantities. Some items may...
In those situations you have to use the NVL function within the AVG function call to assign 0 (or some other useful value) to the column in place of any NULL values. (DECODE, CASE, or theCOALESCE function can be used in place of NVL. SeeChapter 9for details.) Here’s an example: ...