PHP Remove the Second Record Group Name - php

Question

anyone know how to grouping a record with same group but the next row the group name is blank with PHP/MySQL, for example :
Record on the database table :
| id | group_title | item | qty | price
| 1 | G-01 | Mouse | 1 | $5
| 2 | G-01 | Keyboard | 1 | $12
| 3 | G-01 | Keyboard | 1 | $12
| 4 | G-01 | Cable | 1 | $1
| 5 | G-02 | Headset | 1 | $20
And expected result :
| Group | Item Name | Qty | Price/qty | Price Total/item | Price Total/group
| G-01 | Mouse | 1 | $5 | $5 | $30
| | Keyboard | 2 | $12 | $24 |
| | Cable | 1 | $1 | $1 |
| G-02 | Headset | 1 | $20 | $20 | $20
I have tried to do it for many days, but still not solved.
Thank in advance.

Answer 1

You can do it with a simple IF and a uservar like this query:
SELECT
IF(g.gname = #myg, '', #myg:= gname) AS gname,
g.mytext
FROM grouptab g
CROSS JOIN ( SELECT #myg:='') AS init
ORDER BY g.gname;
Sample
MariaDB [test]> select * from grouptab;
+----+-------+---------+
| id | gname | mytext |
+----+-------+---------+
| 1 | G01 | Name 1 |
| 2 | G01 | Name 2 |
| 3 | G02 | Name 88 |
| 4 | G02 | Name 99 |
| 5 | G01 | Name 4 |
+----+-------+---------+
5 rows in set (0.000 sec)
MariaDB [test]> SELECT
-> IF(g.gname = #myg, '', #myg:= gname) AS gname,
-> g.mytext
-> FROM grouptab g
-> CROSS JOIN ( SELECT #myg:='') AS init
-> ORDER BY g.gname;
+-------+---------+
| gname | mytext |
+-------+---------+
| G01 | Name 1 |
| | Name 2 |
| | Name 4 |
| G02 | Name 88 |
| | Name 99 |
+-------+---------+
5 rows in set (0.000 sec)
MariaDB [test]>