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') IF college_name = 'Massachusetts Institute of Technology'ĮLSE IF college_name = 'California Institute of Technology' In the above example, we have performed the following IF-THEN-ELSE logic statements and then ordered the entire result set by college_id. 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) 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) INSERT INTO college_details VALUES (10001, 'Indian Institute of Technology Roorkee', 'Roorkee,India', 10000) We can use the following insert statements. 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. It is more or less like the ELSE statement in IF-THEN-ELSE. default: default argument holds the default value.For example, if expression = search_1 then result will be result_1. result_1, result_2, …, result_n: These arguments hold the result to be returned when the given comparison returns true.search_n: These are the values to be searched for and then compared with the expression argument. expression: expression argument is the value which is to be searched and compared with.The parameters used in the above mentioned syntax are: The basic syntax for writing DECODE function in SQL is as follows:ĭECODE (expression, search_1, result_1. Hadoop, Data Science, Statistics & others
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