but in this case I will obtain an 'a' when idsegmento is equal to '1', I need it to be 'a' even when the string idSegmento contains the '1', kind of like and like statment. SELECT idsegmento AS Segmento, Decode (idsegmento, '1', 'a', 'b' ) FROM gmento. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255. Using Decode as a like statement in oracle. If expr is null, then Oracle returns the result of the first search that is also null. In a DECODE function, Oracle considers two nulls to be equivalent. 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. Oracle automatically converts the return value to the same data type as the first result. Oracle automatically converts expr and each search value to the data type of the first search value before comparing. Consequently, Oracle never evaluates a search if a previous search is equal to expr. 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. Oracle Database uses short-circuit evaluation. The Decode function compares one expression to one or more other expressions and, when the search term is found, returns the match result. The search, result, and default values can be derived from expressions. 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. The string returned is of VARCHAR2 data type and is in the same character set as the first result parameter. expr, search, and result can be any of the data types CHAR, VARCHAR2, NCHAR, or NVARCHAR2. If expr and search are character data, then Oracle compares them using nonpadded comparison semantics. The arguments can be any of the numeric types ( NUMBER, BINARY_FLOAT, or BINARY_DOUBLE) or character types. If default is omitted, then Oracle returns null. If no match is found, then Oracle returns default. The arguments can be any of the numeric types ( NUMBER, BINARYFLOAT, or BINARYDOUBLE) or character types. If you have the query working using a CASE statement then why try to get it to work using a DECODE If it's a problem of getting it to work with PL/SQL then just use dynamic SQL. Doing ranges seems to be better handled with CASE statements. If no match is found, then Oracle returns. In my experience, decode is good for getting one value to be replaced with another (a decode). If expr is equal to a search, then Oracle Database returns the corresponding result. If expr is equal to a, then Oracle Database returns the corresponding. The following example is slightly different from the one above. DECODE compares expr to each search value one by one. The Oracle DECODE() function allows you to add the procedural if-then-else logic to the query.
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