![]() 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 also use DECODE to create columns of summarized data in a single query.In Oracle mode from MariaDB 10.3.2: DECODE(expr, search_expr, result_expr ) The column the DECODE function examines is named STATE Here are the results when using the CUSTOMER table in the pet store schema.For your information, this name is the column alias.It applies to all rows where the value in STATE is neither 'HI' nor 'AK.' In these cases, the value shown here gets returned by the DECODE function. If STATE equals 'AK,' the DECODE function returns this value.The second case is considered if STATE does not contain 'HI.' Here, STATE is compared to 'AK.'.If STATE is equal to 'HI', then the DECODE function returns the literal shown here.The first case looks at the value in STATE and compares it to this value (the literal 'HI').The column the DECODE function examines is named STATE.The MouseOver below shows an example of DECODE. The final value is used when col1's value does not match any of the cases. ,else)Īdd as many case and value pairs as you need. DECODE(value, if1, then1, if2, then2, if3, then3. Traditional Programming LogicIn programming and logic, a common construction of a problem is in the pattern if (temp >32)īasic structure and usage of DECODE. If there is no match, the function returns 'Unknown'. If a match is found, the corresponding job title is returned. In this example, the DECODE function evaluates the job_code column, comparing it with the specified search values ('MGR', 'DEV', and 'HR'). SELECT first_name || ' ' || last_name AS full_name, Here is a sample query using the DECODE function: We want to retrieve the full names of all employees along with a description of their job titles. Suppose we have a table named employees with the following columns: employee_id, first_name, last_name, and job_code. If no match is found and a default value is provided, the function returns the default value otherwise, it returns NULL. If a match is found, it returns the corresponding resultN value. ![]() The DECODE function compares the expression with each searchN value sequentially.
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