O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers. Get Mastering Oracle SQL now with the O’Reilly learning platform. SELECT SUM(DECODE(TO_CHAR(order_dt, 'Q'), '1', sale_price, 0)) Q_1, SUM(DECODE(TO_CHAR (order_dt, 'Q'), '2', sale_price, 0)) Q_2, SUM(DECODE(TO_CHAR (order_dt, 'Q'), '3', sale_price, 0)) Q_3, SUM(DECODE(TO_CHAR (order_dt. To unsubscribe from this group and stop receiving emails from it, send an email to. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255. If expr is null, then Oracle returns the result of the first search that is also null. If you are running on Ubuntu, you will simply need to install package postgresql-9.1-orafce to make orafce available in your PostgreSQL server. In below example, if you replace CASE with. CASE can be an efficient substitute for IF-THEN- ELSE in PL/SQL. Among other Oracle specific functions, orafce also implements DECODE - one that you are looking for. DECODE can work as a function inside SQL only. In order to transform this result set into a single row with fourĬolumns, we need to fabricate a column for each quarter of the yearĪnd, within each column, sum only those records whose order dateįalls in the desired quarter. In a DECODE function, Oracle considers two nulls to be equivalent. If you are used to Oracle specific functions, you might want to install PostgreSQL extension orafce. (A) The Oracle Decode() function is not quite as limited as it first seems. SELECT TO_CHAR(order_dt, 'Q') sales_quarter, SUM(sale_price) tot_sales FROM cust_order WHERE order_dt >= TO_DATE('0','DD-MON-YYYY') AND order_dt < TO_DATE('0','DD-MON-YYYY') GROUP BY TO_CHAR(order_dt, 'Q') ORDER BY 1 Using the Decode() Function For > or < Comparisons.Difference between CASE and DeCODE is :- CASE is a statement where as DECODE is a. The week or months of the year, but you want the result set toĬontain one row with N columns rather than N rows with two columns.Ĭonsider the following query, which aggregates sales data for each Case and decode are pretty much same interms of functionality in Oracle. While we recommend that you use the CASE expression rather than the DECODE function, where feasible we provide both DECODE and CASE versions of each example to help illustrate the differences between the two approaches. If it is not clear the let's understand with the DECODE() Examples.Performing aggregations over a finite set of values, such as days of The following sections present a variety of examples illustrating the uses of conditional logic in SQL statements. The first parameter is your main value or it can be your table value.Second parameter is search value which mean that second parameter value matchs with the first parameter value if it is match then third parameter return their value otherwise fourth parameter returns their value. A decode function basically performs the task of CASE statements. It compares a given expression with each search value one by one and returns a result on the basis of outcomes received from the comparison. In the DECODE() function, We pass four parameter. DECODE function in Standard Query Language (SQL) is used to add procedural IF THEN ELSE like statements to a query. Let's understand the syntax so we can easily use the DECODE() function in Oracle SQL. Syntax of DECODE() function in OracleĭECODE(value,search_value,result,default_value) Oracle DECODE function is used in different database versions like Oracle 9i,Oracle 10g,Oracle 11g and Oracle 12c. If they are equal, the function returns the third argument otherwise returns. Oracle DECODE only use for equality check logic in Oracle SQL. Oracle DECODE() function compares the first argument with the second argument. Note here both argument values are equal then the decode function in Oracle returns the second argument value which is the string ‘Two’. 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 code readability. Oracle DECODE is use for transform the data to one value to another value. This is a very simple example of decode function, in which the Oracle decode function compares the first search argument value with the second search argument value. The DECODE function in Oracle is a versatile and powerful tool that allows users to perform conditional transformations on data within an SQL query. Oracle DECODE is a function in Oracle which help to implement if-then-else logic in SQL query. In this Oracle SQL Tutorial, We will expolre the DECODE() function in Oracle.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |