In fact, you could go further and remove this condition too: AND Nvl (MFTRNAMT, 0) Decode (:b5, 'P', Tonumber (:b9), Nvl (mftrnamt, 0)) But if :b5 is P, then they're different There are a couple of ways you could approach this. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255. Provided :b5 is something other than P, the queries are equivalent. 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 datatype CHAR or if the first result is null, then Oracle converts the return value to the datatype VARCHAR2. Oracle automatically converts the return value to the same datatype as the first result. Oracle automatically converts expr and each search value to the datatype of the first search value before comparing. You can try out automated conversion of databases and applications with. Consequently, Oracle never evaluates a search if a previous search is equal to expr. Please, note, that Ispirer SQLWays 6.0 is no longer supported and provided to clients. That is, 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. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. The search, result, and default values can be derived from expressions. SQL is a standard language for storing, manipulating and retrieving data in databases. 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 datatype, and returns that datatype. The string returned is of VARCHAR2 datatype and is in the same character set as the first result parameter. expr, search, and result can be any of the datatypes 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. If expr is equal to a search, then Oracle Database returns the corresponding result. Description of the illustration decode.gifÄECODE compares expr to each search value one by one.
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