Hello I am new in MySQL and I am tasked to perform a semi join, how do I perform that in MySQL? So I have these following tables:
Table 1:
------ ---------------- -------- --------
| SID | name | course | Org_ID |
------ ---------------- -------- --------
| 1001 | JOSHUA OCRAY | BSIT | 100 |
| 1002 | RAIZEN CO | BSIT | 300 |
| 1003 | EDRIN SAN JUAN | BSIT | 300 |
| 1004 | IAN GASPAR | BSIT | 100 |
| 1005 | DERRICK BONGAR | BSA | 500 |
| 1006 | KYLE TAYAG | BSCE | 200 |
| 1007 | RHEY CRUZ | BSIT | 100 |
| 1008 | EDWIN DIAPANA | BSCS | 400 |
------ ---------------- -------- --------
Table 2:
-------- ----------
| Org_ID | Org_Name |
-------- ----------
| 100 | LITS |
| 200 | ACES |
| 300 | ACSS |
| 400 | COES |
| 500 | BAS |
-------- ----------
What is the exact MySQL code to perform semi join? Thank you very much.
CodePudding user response：
SemiJoin mysql standard query:
select * from Table1 where Org_ID in (select Org_ID from Table2);
Based on other criteria and join in your query, any one of the below semijoin strategy will be used.
Types of semijoin strategies available in MySQL: