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,default ) DECODE Function Parameters The parameters of the Oracle DECODE function are: expression (mandatory): This is the value to compare. This example contains characters that aren't valid base64 characters. Syntax The syntax of the DECODE function is: DECODE ( expression, search, result, search, result. BASE64_DECODE varchar contains characters not in the base64 alphabet In contrast to example B, this example base64 string was encoded using RFC 4648 Table 2 (url_safe), but can be decoded the same way as example B. BASE64_DECODE varchar url_safe base64 string Note the string contains URL-unsafe characters = and /. In the following example, the string is base64 decoded.

In the following example, the base64 encoded string is decoded back into varbinary.

If the input contains more than two padding characters or padding characters followed by extra valid input the function returns error Msg 9803, State 23.

If the data has valid characters, but incorrectly formatted, the function returns error Msg 9803, State 21.

When the input contains characters not contained within the standard or URL-safe alphabets specified by RFC 4648 the function returns error "Msg 9803, Level 16, State 20, Line 15, Invalid data for type "Base64Decode"".

This function ignores whitespace characters: \n, \r, \t, and. The URL-safe alphabet specified within RFC 4648 Table 2 is also accepted. The encoded string's alphabet must be that of RFC 4648 Table 1 and may include padding, though padding is not required.

If the input expression is null, the output is null.

Varbinary(max) if the input is varchar(max).

Transact-SQL syntax conventions Syntax BASE64_DECODE(expression)Īn expression of type varchar (n | max). The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255.Applies to: SQL Endpoint and Warehouse in Microsoft FabricīASE64_DECODE converts a base64 encoded varchar into the corresponding varbinary. 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. Introduction to SQL Functions, Expressions, and Predicates Overview Changes and Additions Functions. Consequently, Oracle never evaluates a search if a previous search is equal to expr. CASE function Comparison Operators DECODE.

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 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. If expr is equal to a search, then Oracle Database returns the corresponding result. DECODE compares expr to each search value one by one.