首要有:NVL,NVL2,NULLIF,COALESCE,这几个函数用在各个类型上都可以。 下面简单介绍一下几个函数的用法。 在介绍这个之前你必须熟悉打听什么是oracle中的空值null 1.NVL函数 NVL函数的格局如下:NVL(expr1,expr2) 含义是:若是oracle第一个参数为空那么显示第二个参数的值,若是第一个参数的值不为空,则显示第一...
The Oracle NVL () function in Oracle can be defined as a function which allows the user to replace the null value or an empty string in the result set with a better alternative like a string value and this function returns the not non value of the same data type of the base expression...
SQL>CREATEOR REPLACEPROCEDUREshowemps (where_in IN VARCHAR2 := NULL) 2 IS 3 TYPE cv_typ IS REF CURSOR; 4 cv cv_typ; 5 v_nm emp.ename%TYPE; 6BEGIN 7 OPEN cv FOR 8 'SELECT enameFROMempWHERE' || NVL (where_in, '1=1'); 9 LOOP 10 FETCH cv INTO v_nm; 11 EXIT WHEN cv%N...
Use PL/SQL Expression to specify an expression in valid PL/SQL syntax that evaluates to true or false. For example: NVL(:MY_ITEM,'NO') = 'YES' If the value of :MY_ITEM is YES, as in the previous example, then the condition evaluates as true. If the value of :MY_ITEM is anyt...
First, you create a table in SQL Commands. See Also: "Using SQL Commands" inOracle Database Application Express User's Guide To create the table to store additional information about uploaded files: Go to SQL Commands: Click theHomebreadcrumb link at the top of the page as shown inFigure ...
“Unable to enlist in the transaction” with Oracle linked server from MS SQL Server [<Name of Missing Index, sysname,>] in non clustered index [Execute SQL Task] Error: The value type (__ComObject) can only be converted to variables of type Object. [ODBC Driver Manager] Data sourc...
An ORM library is written in our language of choice and encapsulates the code needed to manipulate the data. Therefore we don’t need to directly use the SQL; we can interact instantly with an object from our code, instead of a database table. The ORM tool translates the interaction into...
How to Perform Table Partition in Oracle? In the previous section, we discussed the definition of table partition. In this section, we are going to discuss how to perform table partition in Oracle. To do this there are four ways in which we can do partition in Oracle. ...
The decode function can be used in SQL for and IF-THEN-ELSE construction. It's an alternative for the CASE statement which was introduced in Oracle 8. Syntax: decode( expression , compare_value, return_value, [,compare, return_value] ... [,default_return_value] ) ...
Oracle NVL() Function with Examples Oracle SUBSTR() function with Examples Oracle TO_DATE() with complete examples Oracle DECODE function Oracle INSTR() function with examples Oracle TO_CHAR() function Oracle TO_TIMESTAMP Number Functions (Math Functions) Character Functions Miscellaneous Functions Ag...