Użyj SELECT ... FROM DUAL w USING klauzula do wygenerowania jednego wiersza z Twoimi danymi:
Konfiguracja schematu Oracle 11g R2 :
create table student (
sid int,
name varchar(20),
major varchar(10),
gpa float,
tutorid int,
PRIMARY KEY (sid)
);
insert into student values(101,'Bill','CIS',3.45,102);
insert into student values(102,'Mary','CIS',3.1,null);
insert into student values(103,'Sue','Marketing',2.95,102);
insert into student values(104,'Tom','Finanace',3.5,106);
insert into student values(105,'Alex','CIS',2.75,106);
insert into student values(106,'Sam','Marketing',3.25,103);
insert into student values(107,'Joan','Finance',2.9,102);
Zapytanie 1 :
merge into student dst
using (
SELECT 123 AS sid,
'Rahul' AS name,
'Temp' AS major
FROM DUAL
) src
on (src.major=dst.major)
when matched then
update set name=src.name
when not matched then
insert(SID,name,major) values ( src.sid, src.name, src.major )
Zapytanie 2 :
SELECT * FROM student
Wyniki :
| SID | NAME | MAJOR | GPA | TUTORID |
|-----|-------|-----------|--------|---------|
| 101 | Bill | CIS | 3.45 | 102 |
| 102 | Mary | CIS | 3.1 | (null) |
| 103 | Sue | Marketing | 2.95 | 102 |
| 104 | Tom | Finanace | 3.5 | 106 |
| 105 | Alex | CIS | 2.75 | 106 |
| 106 | Sam | Marketing | 3.25 | 103 |
| 107 | Joan | Finance | 2.9 | 102 |
| 123 | Rahul | Temp | (null) | (null) |
