![]() If no matches are found, the default expression is returned, or NULL if no default is provided.ĭECODE_ORACLE is a synonym for the Oracle-mode version of the function, and is available in all modes. If it finds a match, the corresponding result expression is returned. In Oracle mode from MariaDB 10.3.2, DECODE compares expr to the search expressions, in order. The resulting string will be the original string only if pass_str is the same. crypt_str should be a string returned from ENCODE(). In the default mode, DECODE decrypts the encrypted string crypt_str using pass_str as the In all modes from MariaDB 10.3.2: DECODE_ORACLE(expr, search_expr, result_expr ) You can view EDUCBA’s recommended articles for more information.In Oracle mode from MariaDB 10.3.2: DECODE(expr, search_expr, result_expr ) We hope that this EDUCBA information on “SQL DECODE()” was beneficial to you. It is a built-in function in ORACLE / PL SQL database management servers. The function is a close relative of CASE statements. In the above example, we have performed the following task using the DECODE function and have then ordered the result set by college_id.ĭECODE function is used to perform procedural IF-THEN-ELSE logic in SQL. SQL query to categories college fees into affordable and expensive for an Indian student, considering everything above $ 10000 as expensive.ĭECODE(fees,10000,'Affordable','Expensive') In the above example, we have performed the following IF-THEN-ELSE logic statements and then ordered the entire result set by college_id.Ĭode: IF college_name = 'Massachusetts Institute of Technology'ĮLSE IF college_name = 'California Institute of Technology' 'MIT','California Institute of Technology','CalTech','IIT') as college_name SELECT college_id, DECODE(college_name,'Massachusetts Institute of Technology', SQL query to illustrate abbreviation of college names based on the available data using DECODE function. ![]() Simple illustration of above mentioned DECODE function is as follows: In this example, we have performed a simple SQL task for categorizing colleges based on their location. ![]() Simple SQL query to illustrate use of DECODE function.ĭECODE (college_id, 10003,'Massachusetts, USA', The data in the “college_details” table after performing the above mentioned INSERT operations looks something as shown below: INSERT INTO college_details VALUES (10003, 'Massachusetts Institute of Technology', 'Massachusetts,India', 51520) select * from college_details INSERT INTO college_details VALUES (10004, 'California Institute of Technology', 'California ,USA', 60520) INSERT INTO college_details VALUES (10002, 'Indian Institute of Technology Bombay', 'Mumbai,India', 10000) We can use the following insert statements.Ĭode: INSERT INTO college_details VALUES (10001, 'Indian Institute of Technology Roorkee', 'Roorkee,India', 10000) Having created the table, let us now input some random data in it to work with in the subsequent exercises. We can use the following SQL CREATE TABLE statement to perform the task.Ĭollege_name character varying(255) NOT NULL,Ĭollege_location character varying(255) NOT NULL, Let us first create a ‘college_details’ table which contains college id, college name, location and fees for demonstration purposes. The simple illustration of the above mentioned decode function is as follows: The functionality of DECODE in ORACLE with following flowchart. And it finally converts back the data_type of result to the data_type of the expression. The DECODE function automatically converts or casts the expression to the data type of the first search argument or search_1. ![]() ![]() If it’s FALSE then DEFAULT value is returned. The first step is comparison of expression and search_1, if the expression = search_1 is TRUE then result_1 is returned. We can use the DECODE function as a part of the SELECT statement, ORDER BY etc. Get Mastering Oracle SQL now with the O’Reilly learning platform. It is more or less like the ELSE statement in IF-THEN-ELSE. We can do that with DECODE: SELECT SUM (DECODE (TOCHAR (orderdt, 'Q'), '1', saleprice, 0)) Q1, SUM (DECODE (TOCHAR (orderdt, 'Q'), '2', saleprice, 0)) Q2, SUM (DECODE (TOCHAR (orderdt, 'Q'), '3', saleprice, 0)) Q3, SUM (DECODE (TOCHAR (orderdt. DECODE then looks for the pair in which the value matches the input.
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