The DECODE function in Oracle is a versatile and powerful tool that allows users to perform conditional transformations on data within an SQL query. It is similar to the CASE statement, but it offers a more compact syntax, making it a popular choice for simplifying complex queries and improving...
Oracle returns the corresponding return_value. If no match is found, Oracle returns the defaul_return_value. If no default value is specified, the null value will be returned.
In Oracle/PLSQL, thedecodefunction has the functionality of an IF-THEN-ELSE statement. The syntax for thedecodefunction is: decode( expression , search , result [, search , result]... [, default] ) expressionis the value to compare. searchis the value that is compared againstexpression. ...
This function decodes a raw token value. Syntax Copy APEX_JWT.DECODE ( p_value IN VARCHAR2, p_signature_key IN RAW DEFAULT NULL ) RETURN t_token; Parameters ParameterDescription p_value A raw token value contains 3 base64-encoded parts, which are separated by '.'. The parts are header...
∙Oracle 9i, Oracle 10g, Oracle 11g 例如：You could use the decode function in an SQL statement as follows:select supplier_name,decode(supplier_id,1000,'IBM',10001,'Microsoft','1002','Hewlett Packard','Gateway') result from suppliers;上面的sql语句相当于下面的IF-THEN-ELSE :IF supplier_...
[Oracle] decode函數使用 ※引述自http://www.techonthenet.com/oracle/functions/decode.php In Oracle/PLSQL, thedecodefunction has the functionality of an IF-THEN-ELSE statement. The syntax for thedecodefunction is: decode( expression , search , result [, search , result]… [, default] )...
In a DECODE function, Oracle considers two nulls to be equivalent. If expr is null, then Oracle returns the result of the first search that is also null. 但是要注意的是,为这条SQL选择索引,只能对id列创建,不能对decode函数创建,因为Oracle不能基于未知的用户输入创建索...
This tutorial provides a comprehensive guide to using the SQL DECODE() function in Oracle. I will also compare DECODE() to CASE WHEN in Oracle and help you understand when to use each function. Finally, I will provide code for the equivalent transformations in SQL Server, PostgreSQL, and ...
Oracle 9i, Oracle 10g, Oracle 11g 例如: You could use the decode function in an SQL statement as follows: select supplier_name,decode(supplier_id,1000,'IBM',10001,'Microsoft','1002','Hewlett Packard','Gateway') result from suppliers; ...
SQL> create or replace function sleep_now return number is 2 i number; 3 begin 4 i :=0; 5 while8 6 i<=1000000 7 loop 8 i :=i+1; 9 end loop; 10 return i; 11 end; 12 / --创建一个sleep_now函数,目的是为了加长sql执行的时间 ...