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The NVL function evaluates whether a column or expression of any data type is null If the term is null, it returns an alternative not-null value; otherwise, the original term is returned The NVL function takes two mandatory parameters; its syntax is NVL(original, ifnull), where original represents the term being tested and ifnull is the result returned if the original term evaluates to null The data types of the original and ifnull parameters must always be compatible Either they must be of the same type, or it must be possible to implicitly convert ifnull to the type of the original parameter The NVL function returns a value with the same data type as the original parameter Consider the following three queries: Query 1: select nvl(1234) from dual; Query 2: select nvl(null, 1234) from dual; Query 3: select nvl(substr('abc', 4), 'No substring exists') from dual; Since the NVL function takes two mandatory parameters, query 1 returns the error ORA-00909: invalid number of arguments Query 2 returns 1234 after the null keyword is tested and found to be null Query 3 involves a nested SUBSTR function that attempts to extract the fourth character from a three-character string that returns null, leaving the outer function NVL(null, No substring exists ) to execute, which then returns the string No substring exists TIP The NVL function is invaluable for converting null numeric values to zero, so that arithmetic on them doesn t return null

Unsigned byte Signed byte Signed short Unsigned short Signed integer Unsigned int Signed big integer Unsigned big integer Floating-point number Double-precision floating-point number Fixed-precision number Unicode string Unicode character Boolean value

Operators in Order of Precedence (continued)

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The NVL2 function provides an enhancement to NVL but serves a very similar purpose It evaluates whether a column or expression of any data type is null or not If the first term is not null, the second parameter is returned, or else the third parameter is returned Recall that the NVL function is different, since it returns the original term if it is not null The NVL2 function takes three mandatory parameters with the syntax NVL2(original, ifnotnull, ifnull), where original represents the term being tested ifnotnull is returned if original is not null, and ifnull is returned if original is null The data types of the ifnotnull and ifnull parameters must be compatible, and they cannot be of type LONG Either they must be of the same type, or it must be possible to convert ifnull to the type of

The operators in Table 3-1 are also listed in overall precedence, from top to bottom the first item in the table, terms and list operators, have the highest precedence and will always be evaluated by Perl first when used within a compound statement

$a = 5*6+4;

the ifnotnull parameter The data type returned by the NVL2 function is the same as that of the ifnotnull parameter Consider the following queries: Query 1: select nvl2(1234, 1, 'a string') from dual; Query 2: select nvl2(null, 1234, 5678) from dual; Query 3: select nvl2(substr('abc', 2), 'Not bc', 'No substring') from dual; PART II The ifnotnull term in query 1 is a number, and the ifnull parameter is a string Since there is a data type incompatibility between them, an ORA-01722: invalid number error is returned Query 2 returns the ifnull parameter, which is 5678 Query 3 extracts the characters bc using the SUBSTR function and the NVL2( bc , Not bc , No Substring ) function is evaluated and the ifnotnull parameter, Not bc , is returned

$a = (5*6)+4;

The NULLIF function tests two terms for equality If they are equal, the function returns a null, or else it returns the first of the two terms tested The NULLIF function takes two mandatory parameters of any data type Its syntax is NULLIF(ifunequal, comparison_term), where the parameters ifunequal and comparison_ term are compared If they are identical, then NULL is returned If they differ, the ifunequal parameter is returned Consider the following queries: Query 1: select nullif(1234, 1234) from dual; Query 2: select nullif('24-JUL-2009', '24-JUL-09') from dual; Query 1 returns a null, since the parameters are identical The character literals in query 2 are not implicitly converted to DATE items and are compared as two character strings by the NULLIF function Since the strings are of different lengths, the ifunequal parameter 24-JUL-2009 is returned Figure 10-4 shows how NULLIF is nested as a parameter to the NVL2 function The NULLIF function itself has the SUBSTR and UPPER character functions embedded in the expression used as its ifunequal parameter The EMAIL column is compared with an expression, formed by concatenating the first character of the FIRST_NAME to the uppercase equivalent of the LAST_NAME column, for employees with four-characterlong first names When these terms are equal, NULLIF returns a null, or else it returns the evaluated ifunequal parameter This is used as a parameter to NVL2 The NVL2 function provides descriptive text classifying rows as matching the pattern or not

$a = 5*(6+4);

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