oracle declare
时间: 2023-09-28 07:08:53 浏览: 49
Oracle DECLARE statement is used to declare variables and constants in PL/SQL code. These variables and constants can be used for storing data, performing calculations, and making decisions in the program. The syntax for the DECLARE statement is as follows:
DECLARE
variable_name1 data_type;
variable_name2 data_type := initial_value;
constant_name constant_data_type := constant_value;
BEGIN
-- PL/SQL code goes here
END;
In this syntax, variable_name1, variable_name2, and constant_name represent the names of the variables and constants that you want to declare. data_type represents the data type of the variables, such as VARCHAR2, NUMBER, DATE, etc. initial_value and constant_value represent the initial value and constant value of the variables and constants, respectively.
After declaring the variables and constants, you can use them in the PL/SQL code to perform various operations. The DECLARE statement is usually placed at the beginning of the PL/SQL block, before the BEGIN keyword.