The DECODE function in Oracle is a versatile and powerful tool that allows users to perform conditional transformations on data within an SQL query. It is similar to the CASE statement, but it offers a more compact syntax, making it a popular choice for simplifying complex queries and improving...
※引述自http://www.techonthenet.com/oracle/functions/decode.php In Oracle/PLSQL, thedecodefunction has the functionality of an IF-THEN-ELSE statement. The syntax for thedecodefunction is: decode( expression , search , result [, search , result]… [, default] ) expressionis the value to ...
Oracle/PLSQL syntax of the DECODE functionDECODE( expression_id , search_id , result_id [, search , result]... [, default] )Parameters or argumentsexpression_id –is an expression for comparison. search_id –value that is compared to. result_id –value returned if the expression coincided...
E Oracle SQL Reserved Words and Keywords F Extended Examples Index DECODE Syntax Description of the illustration decode.eps Purpose DECODE compares expr to each search value one by one. If expr is equal to a search, then Oracle Database returns the corresponding result. If no match is fou...
Oracle Function: Case and Decode CASE expression perform if-then-else logic in SQL without having to use PL/SQL. CASE works in a similar manner to DECODE(). CASE is ANSI-compliant. There are two types of CASE expressions: Simple case expressions use expressions to determine the returned ...
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RETURN 'Not one or two';ENDIF;Code language:SQL (Structured Query Language)(sql) Oracle DECODE() function syntax# The following illustrates the syntax of the OracleDECODE()function: DECODE (e , s1, r1[, s2, r2], ...,[,sn,rn] [, d]);Code language:SQL (Structured Query Language)(...
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InOracle/PLSQL,theinstrfunctionreturnsthelocationofasubstringinastring. Thesyntaxfortheinstrfunctionis: instr(string1,string2,[start_position],[nth_appearance]) string1isthestringtosearch. string2isthesubstringtosearchforinstring1. start_positionisthepositioninstring1wherethesearchwill start.Thisargumentis...
Understanding the SQL DECODE() Function The DECODE() function is available in the Oracle database and allows you to transform a column using conditional logic. The DECODE() function allows for multiple conditional transformations using one simple query. The syntax of the DECODE() function is as ...