The Oracle decode function The decode function can be used in SQL for and IF-THEN-ELSE construction. The UTL_ENCODE package provides functions that encode RAW data into a standard encoded format so that the data can be transported between hosts. 4.3.5 Specifying the Page Encoding in Oracle PL/SQL Server Pages You can specify page encoding for PL/SQL front-end applications and Oracle PL/SQL Server Pages (PSP) in two ways: Specify the page encoding in the NLS_LANG parameter in the corresponding database access descriptor (DAD). I haven't even actually used this to send plaintext, HTML is preferred. If expr and search are character data, then Oracle compares them using nonpadded comparison semantics. Data Type Comparison Rules for information on comparison semantics, Data Conversion for information on data type conversion in general, Floating-Point Numbers for information on floating-point comparison semantics, Implicit and Explicit Data Conversion for information on the drawbacks of implicit conversion, COALESCE and CASE Expressions, which provide functionality similar to that of DECODE, Appendix C in Oracle Database Globalization Support Guide for the collation determination rules, which define the collation DECODE uses to compare characters from expr with characters from search, and for the collation derivation rules, which define the collation assigned to the return value of this function when it is a character value. For example, say we have a column named REGION, with values of N, S, W and E. When we run SQL queries, we want to transform these values into North, South, East and West. DECODE compares expr to each search value one by one. If no match is found, then Oracle returns default. expr, search, and result can be any of the datatypes CHAR, VARCHAR2, NCHAR, or NVARCHAR2. Hi Tom, I'd like to use a decode statement that returns multiple values instead of a single value. If no match is found, then Oracle returns default. If default is omitted, then Oracle returns null. If default is omitted, then Oracle returns null. The purpose of the Oracle DECODE function is to perform an IF-THEN-ELSE function. DECODE works with expressions that are scalar values only. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255. What is the use of the Decode Function in SQL? The database evaluates each search value only before comparing it to expr, rather than evaluating all search values before comparing any of them with expr. This example decodes the value warehouse_id. You could use the DECODE function in a SQL statement as follows: SELECT supplier_name, DECODE(supplier_id, 10000, 'IBM', 10001, 'Microsoft', 10002, 'Hewlett Packard', 'Gateway') result FROM suppliers; The above DECODE statement is equivalent to the following IF-THEN-ELSE statement: The Oracle DECODE() function allows you to add the procedural if-then-else logic to the query.. If no match is found, then Oracle returns default. Purpose. The following procedure uses the DBMS_LOB package to read chunks of data from a BFILE pointing to the image on the filesystem. The UTL_ENCODE and UTL_RAW packages are used to encode the data and convert it to a string suitable for inclusion into the HTML. The search, result, and default values can be derived from expressions. It works similar to an IF statement within other languages. In a DECODE function, Oracle considers two nulls to be equivalent. As we discussed earlier, a Decode function in Oracle helps us to add if-then-else logic to a query procedurally. Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production SQL*Plus: Release 10.1.0.5.0 NLS_LANGUAGE AMERICAN NLS_TERRITORY AMERICA NLS_CHARACTERSET WE8MSWIN1252 NLS_NCHAR_CHARACTERSET AL16UTF16 SQL Script to get the output as HTML. Syntax. CASE can work as a PL/SQL construct but DECODE is used only in SQL … For a) here you can write a custom procedure which creates the html out of the sql … Any quick way to achieve this ? This tutorial shows how to collect values from multiple rows into a single, comma delimited string. If expr is equal to a search, then Oracle Database returns the corresponding result. That is, the database evaluates each search value only before comparing it to expr, rather than evaluating all search values before comparing any of them with expr. This example decodes the value warehouse_id. It allows you to provide a value, and then evaluate other values against it and show different results. In a DECODE function, Oracle considers two nulls to be equivalent. Although DECODE is very powerful, how it works is actually very easy to understand: It compares the expression passed in as the first argument, to each of the search values passed in subsequent arguments, one by one, and if it finds a match, returns the corresponding result, otherwise returns the default value. a) PL/SQL procedure to create the body html out of the SQL. If the first result has the datatype CHAR or if the first result is null, then Oracle converts the return value to the datatype VARCHAR2. Conditional Where clause with decode Hello there,Good Day!I have a query at hand:SELECT mf_trn_id FROM mf_transactions WHERE MF_TRN_AGENT_CD = :b1 AND MF_TRN_PAN_NO = :b2 AND MF_TRN_SCH_CD = :b3 AND MF_TRN_COMP_CD = :b4 AND MF_TRN_CD = :b5 AND MF_TRN_FOLIO = Decode(:b5, 'P', mf_trn_folio, :b7) The !s are showing up in the HTML formatted messages. In this tutorial, you have learned how to use the SQL DECODE() function to … I have a URL encoded string stored in oracle DB table. It's an alternative for the CASE statement which was introduced in Oracle 8. set pagesize 1000. The Oracle decode statement can be used in PL/SQL and it was developed to allow us to transform data values at retrieval time. DECODE compares expr to each search value one by one. If expr is equal to a search, then Oracle Database returns the corresponding result. The package also contains the decode counterpart functions of the encode functions. If expr and search are character data, then Oracle compares them using nonpadded comparison semantics. SET MARKUP HTML ON SPOOL ON. If no match is found, then Oracle returns default. When we run SQL queries inside PL/SQL, we want to transform these values into North, South, East and West. Here is how we do this with the decode function, which can be placed inside a PL/SQL function or stored procedure: set termout off. Or you can use the reverse operation of pivot —UNPIVOT—to break up the columns to become rows, as is possible in Oracle Database 11g. If warehouse_id is 1, then the function returns 'Southlake'; if warehouse_id is 2, then it returns 'San Francisco'; and so forth. The DECODE() function returned the column to sort based on the input argument. DECODE compares expr to each search value one by one. If warehouse_id is 1, then the function returns 'Southlake'; if warehouse_id is 2, then it returns 'San Francisco'; and so forth. For JSON data processed by Oracle Database, any needed character-set conversions are performed automatically. If expr is null, then Oracle returns the result of the first search that is also null. Oracle automatically converts the return value to the same data type as the first result. Syntax: decode( expression , compare_value, return_value, [,compare, return_value] ... [,default_return_value] ) with: expression is the value to evaluate Oracle automatically converts expr and each search value to the datatype of the first search value before comparing. If the first search-result pair are numeric, then Oracle compares all search-result expressions and the first expr to determine the argument with the highest numeric precedence, implicitly converts the remaining arguments to that datatype, and returns that datatype. Using the table above out Oracle DBA has prepared an example with Oracle Decode function. If warehouse_id is not 1, 2, 3, or 4, then the function returns 'Non domestic'. If default is omitted, then Oracle returns null. Consequently, Oracle never evaluates a search if a previous search is equal to expr. Share. PL/SQL is a procedural language designed specifically to embrace SQL statements within its syntax. Oracle automatically converts expr and each search value to the data type of the first search value before comparing. SQL Delta for Oracle. If expr is equal to a search, then Oracle Database returns the corresponding result. SELECT DECODE(DUMMY,NULL,'Empty','X','Dual Default','Unknown') FROM DUAL; The SQL query returned “Dual Default” because the Dummy column has value “X” as we did mention above and the first condition “NULL” didn’t match. to convert a column in oracle which contains HTML items to plain text, you could use: trim (regexp_replace (UTL_I18N.unescape_reference (column_name), '< [^>]+>')) It will replace HTML character as above stated but will also remove HTML tags en remove leading and trailing spaces. In this respect, JSON data is simpler to use than XML data. Description of the illustration decode.gif. The Decode function compares one expression to one or more other expressions and, when the search term is found, returns the match result expression. The arguments can be any of the numeric types (NUMBER, BINARY_FLOAT, or BINARY_DOUBLE) or character types. The string returned is of VARCHAR2 data type and is in the same character set as the first result parameter. b) PL/SQL procedure to send the body html in an html email to the admin . CASE can work with predicates and sub queries in searchable form. It’s similar to a CASE statement, but CASE is a statement where DECODE is a function. Oracle Database uses short-circuit evaluation. Description of the illustration decode.gif. Oracle automatically converts the return value to the same datatype as the first result. The Oracle decode statement was developed to allow us to transform data values at retrieval time. a collection)? You can use UTL_ENCODE functions to encode the body of email text. DECODE . The DECODE function can be used in Oracle/PLSQL. Scripting on this page enhances content navigation, but does not change the content in any way. If the first result has the data type CHAR or if the first result is null, then Oracle converts the return value to the data type VARCHAR2. The search, result, and default values can be derived from expressions. The spreadsheet data must be de-normalized to a relational format and then stored. Description of the illustration decode.eps. SDO also scripts the differences and applies the changes to your target. How can I url decode a value in Oracle? In this case, the DECODE() function returned the salary column, therefore, the result set was sorted by salary column. The Basics: What it is, and How it works. Encoding Images from the File System; Encoding Images from HTTP; Encoding Images from a BLOB Column; Encoding Images from the File System. JSON data always uses the Unicode character set. If warehouse_id is not 1, 2, 3, or 4, then the function returns 'Non domestic'. How can I have a decode statement that returns multiple values (e.g. I hope it will help someone. expr, search, and result can be any of the data types CHAR, VARCHAR2, NCHAR, or NVARCHAR2. The string returned is of VARCHAR2 datatype and is in the same character set as the first result parameter. This is also known as "string aggregation". I want to url_encode it while selecting the results. DECODE compares expr to each search value one by one. And at run-time, both PL/SQL and SQL run within the same server process, bringing optimal efficiency. The arguments can be any of the numeric types (NUMBER, BINARY_FLOAT, or BINARY_DOUBLE) or character types. If the first search-result pair are numeric, then Oracle compares all search-result expressions and the first expr to determine the argument with the highest numeric precedence, implicitly converts the remaining arguments to that data type, and returns that data type. Summary: in this tutorial, you will learn how to use the Oracle DECODE() function to embed if-then-else logic in SQL queries.. Introduction to Oracle DECODE() function. The arguments can be any of the numeric types (NUMBER, BINARY_FLOAT, or BINARY_DOUBLE) or character types spool fnd_debug_report.html. Another MySQL option that may look more like Oracle’s DECODE is a combination of FIELD and ELT.In the code that follows, FIELD() returns the argument list position of the string that matches Age.ELT() returns the string from ELTs argument list at the position provided by FIELD().For example, if Age is 14, FIELD(Age, ...) returns 2 because 14 is the 2nd argument of FIELD (not counting … Consequently, Oracle never evaluates a search if a previous search is equal to expr. SET MARKUP HTML ON TABLE "class=sysaud cellspacing=2 border='2' width='95%' align='center' " ENTMAP OFF. We are running this from an 8.1.7.0.0 database on Solaris, the client workstations are Windows 2000 (SP2) with Outlook 2000 as the e-mail client. https://www.databasestar.com/oracle-decode-function/ The Oracle DECODE function lets you perform IF-THEN-ELSE functionality in your queries. SQL Delta for Oracle Databases (SDO) is a brand new database compare tool for Oracle that compares the database schema of two Oracle databases. This is an important part of the JSON Data Interchange Format (RFC 4627). If expr is null, then Oracle returns the result of the first search that is also null. PL/SQL program units are compiled by the Oracle Database server and stored inside the database. If default is omitted, then Oracle returns null. 205 UTL_ENCODE. Of course, you can write a complex SQL*:Loader or SQL script using DECODE to load the data into CUSTOMERS table. set pages 999. set pagesize 999. set feedback off. SDO will compare all of the objects in an Oracle database and display the differences. We shall try to understand the Decode function, its syntax through examples. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255. The statement where I will be using this is something like:select * from v_viewname v where v.enterprise in decode(v_in_enterprise, 'ALL', v.enterprise, TABLE(f_stringto If expr is equal to a search, then Oracle Database returns the corresponding result. In the following example, the Oracle DECODE() function compares the first argument (1) with the second argument (1). In this blog, we will try to get a complete understanding of DECODE function in SQL.We will be learning the various ways to use DECODE, its syntax and understand it with examples. Another MySQL option that may look more like Oracle's DECODE is a combination of FIELD and ELT.In the code that follows, FIELD() returns the argument list position of the string that matches Age.ELT() returns the string from ELTs argument list at the position provided by FIELD().For example, if Age is 14, FIELD(Age, ...) returns 2 because 14 is the 2nd argument of FIELD (not counting Age). Oracle Database uses short-circuit evaluation. For decoding data encoded with the form-URL-encode scheme, the following function implements the decording scheme: CREATE OR REPLACE FUNCTION form_url_decode ( data IN VARCHAR2, charset IN VARCHAR2) RETURN VARCHAR2 AS BEGIN RETURN utl_url.unescape ( replace (data, '+', ' … DECODEは、 expr を各 search 値と1つずつ比較します。 expr が search と等しい場合、Oracle Databaseは対応する result を戻します。 一致する値が見つからない場合は、 default を戻します。 default が省略されている場合は、NULLを戻します。.