Mysql: Update using select and local variable - mysql

Question

I am looking for an update statement that will group terms by language in the following table
CREATE TABLE _tempTerms(
ID int(8) unsigned NOT NULL AUTO_INCREMENT,
TTC_ART_ID mediumint(8) unsigned,
TTC_TYP_ID mediumint(8) unsigned,
Name varchar(200),
Value varchar(200),
ID_Lang tinyint(3) unsigned,
Sequence smallint unsigned,
Group_ID int(8) unsigned DEFAULT 0,
PRIMARY KEY(TTC_ART_ID, TTC_TYP_ID, Name, Value),
UNIQUE KEY(ID)
);
All data except Group_ID is inserted into the table. I need to update the table so that I auto-generate new Group_IDs and the Group_ID for all records with same combination of TTC_ART_ID, TTC_TYP_ID and Sequence will get the same Group_ID. I guess I need a variable to store the current value for Group_ID and so far I experimented with
SET #group_id:=1;
UPDATE _tempTerms
SET Group_ID = (#group_id := #group_id + 1);
which just gives a new group_id to every new record. I believe I need a SELECT Statement somewhere to check if there is a group_id already given, but I am confused on how I go about it.
Thank you

Answer 1

Schema:
create database xGrpId; -- create a test db
use xGrpId; -- use it
CREATE TABLE _tempTerms(
ID int(8) unsigned NOT NULL AUTO_INCREMENT,
TTC_ART_ID mediumint(8) unsigned,
TTC_TYP_ID mediumint(8) unsigned,
Name varchar(200),
Value varchar(200),
ID_Lang tinyint(3) unsigned,
Sequence smallint unsigned,
Group_ID int(8) unsigned DEFAULT 0,
PRIMARY KEY(TTC_ART_ID, TTC_TYP_ID, Name, Value),
UNIQUE KEY(ID)
);
-- truncate table _tempTerms;
insert _tempTerms(TTC_ART_ID,TTC_TYP_ID,Name,Value,ID_Lang,Sequence) values
(1,2,'n','v1',66,4),
(1,1,'n','v2',66,4),
(1,1,'n','v3',66,3),
(1,1,'n','v4',66,4),
(1,1,'n','v5',66,4),
(1,1,'n','v6',66,3),
(2,1,'n','v7',66,4),
(1,2,'n','v8',66,4);
View them:
select * from _tempTerms order by id;
select distinct TTC_ART_ID,TTC_TYP_ID,Sequence from _tempTerms;
-- 4 rows
-- update _tempTerms set Group_ID=0; -- clear before testing
The query:
update _tempTerms t
join
( select TTC_ART_ID,TTC_TYP_ID,Sequence,#rn:=#rn+1 as rownum
from
( select distinct TTC_ART_ID,TTC_TYP_ID,Sequence
from _tempTerms
-- put your `order by` here if needed
order by TTC_ART_ID,TTC_TYP_ID,Sequence
) d1
cross join (select #rn:=0) as xParams
) d2
on d2.TTC_ART_ID=t.TTC_ART_ID and d2.TTC_TYP_ID=t.TTC_TYP_ID and d2.Sequence=t.Sequence
set t.Group_ID=d2.rownum;
Results:
select * from _tempTerms order by TTC_ART_ID,TTC_TYP_ID,Sequence;
+----+------------+------------+------+-------+---------+----------+----------+
| ID | TTC_ART_ID | TTC_TYP_ID | Name | Value | ID_Lang | Sequence | Group_ID |
+----+------------+------------+------+-------+---------+----------+----------+
| 3 | 1 | 1 | n | v3 | 66 | 3 | 1 |
| 6 | 1 | 1 | n | v6 | 66 | 3 | 1 |
| 2 | 1 | 1 | n | v2 | 66 | 4 | 2 |
| 4 | 1 | 1 | n | v4 | 66 | 4 | 2 |
| 5 | 1 | 1 | n | v5 | 66 | 4 | 2 |
| 1 | 1 | 2 | n | v1 | 66 | 4 | 3 |
| 8 | 1 | 2 | n | v8 | 66 | 4 | 3 |
| 7 | 2 | 1 | n | v7 | 66 | 4 | 4 |
+----+------------+------------+------+-------+---------+----------+----------+
Cleanup:
drop database xGrpId;
d1, d2, and xParams are derived tables. Every derived table needs a name. The purpose of xParams and the cross join is merely to bring in a variable to initialize the row number. This is because mysql lacks CTE functionality found in other RDBMS's. So, don't overthink the cross join. It is like saying LET i=0.