如果表类型参数为null，则获取所有记录

Question

在Oracle中，如果表值参数为null，则我想获取column的所有值，否则仅获取匹配的记录。

create or replace PROCEDURE pr_Employees (
    lastnames IN LastName,
    rowCursor OUT SYS_REFCURSOR) IS
BEGIN
Select * from emp where lastname in (
    SELECT COLUMN_VALUE FROM TABLE(lastnames)
)

Answer 1

尝试一下：

create or replace procedure pr_employees
    ( lastnames in lastname
    , rowcursor out sys_refcursor )
is
begin
    open rowcursor for
        select * from emp
        where  lastname in
               ( select column_value from table(lastnames) )
        or     lastnames is empty;
end pr_employees;