Joining the tables.Aggregating and consolidating the counts - sql

Question

enter image description hereI have two tables
Table 1-qualified players
Id_sequence
121
345
765
Table 2 - All enteries related to players Note :there are only 6 game_ids 1a,1b,1c,2a,2b,2c
id_sequence player_id game_id phone_no
121 aaa 1a 111111111
131 aaa 1b 111222111
141 aaa 1a 111112222
345 bbb 2a 222222222
656 bbb 2c 222211122
789 bbb 1c 222211122
632 bbb 2b 222222222
765 ccc 2b 333333333
897 ddd 1a 444444444
433 ddd 2c 555555444
Expected Output:
select all id_sequence from Table 1 and join Table 2.
Then select all other data related to that player_id then aggregate and consolidate the counts
player_id game id_1a game id_1b game id_1c game id_2a game id_2b game id_2c no_of _phones
aaa 2 1 3
bbb 1 1 1 1 2
ccc 1 1
Currently,I am creating a table 3 that stores the player_id obtained from joining table 1 and table 2 .Then again joining table 3 and 2.
Any thoughts and ideas will greatly help.

Answer 1

Test data (see also: dbfiddle)
SQL> select * from ae;
ID_SEQUENCE PLAYER_ID GAME_ID PHONE_NO
121 aaa 1a 111111111
131 aaa 1b 111222111
141 aaa 1a 111112222
345 bbb 2a 222222222
656 bbb 2c 222211122
789 bbb 1c 222211122
632 bbb 2b 222222222
765 ccc 2b 333333333
897 ddd 1a 444444444
433 ddd 2c 555555444
Query
select
dt1.*
, dt2.no_of_phones
from (
(
select game_id, player_id
from ae
) pivot
(
count( game_id ) for game_id in
(
'1a' as "game id_1a"
, '1b' as "game id_1b"
, '1c' as "game id_1c"
, '2a' as "game id_2a"
, '2b' as "game id_2b"
, '2c' as "game id_2c"
)
)
) dt1 join (
select
player_id
, count( phone_no ) no_of_phones
from ae
group by player_id
) dt2
on dt1.player_id = dt2.player_id
order by dt1.player_id
;
Result
PLAYER_ID game id_1a game id_1b game id_1c game id_2a game id_2b game id_2c NO_OF_PHONES
aaa 2 1 0 0 0 0 3
bbb 0 0 1 1 1 1 4
ccc 0 0 0 0 1 0 1
ddd 1 0 0 0 0 1 2

Answer 2

A PIVOT should take care of it
SQL> create table t1 ( id int);
Table created.
SQL>
SQL> insert into t1 values (121 );
1 row created.
SQL> insert into t1 values (345 );
1 row created.
SQL> insert into t1 values (765 );
1 row created.
SQL>
SQL>
SQL> create table t2 ( id int, player varchar2(10), game varchar2(10), phone int );
Table created.
SQL>
SQL> insert into t2 values (121 ,'aaa' , '1a' , 111111111);
1 row created.
SQL> insert into t2 values (131 ,'aaa' , '1b' , 111222111 );
1 row created.
SQL> insert into t2 values (141 ,'aaa' , '1a' , 111112222 );
1 row created.
SQL> insert into t2 values (345 ,'bbb' , '2a' , 222222222 );
1 row created.
SQL> insert into t2 values (656 ,'bbb' , '2c' , 222211122 );
1 row created.
SQL> insert into t2 values (789 ,'bbb' , '1c' , 222211122 );
1 row created.
SQL> insert into t2 values (632 ,'bbb' , '2b' , 222222222 );
1 row created.
SQL> insert into t2 values (765 ,'ccc' , '2b' , 333333333 );
1 row created.
SQL> insert into t2 values (897 ,'ddd' , '1a' , 444444444 );
1 row created.
SQL> insert into t2 values (433 ,'ddd' , '2c' , 555555444);
1 row created.
SQL>
SQL>
SQL> SELECT *
2 FROM (SELECT player, game, phone
3 FROM t2)
4 PIVOT (count(phone) AS cnt FOR (game) IN ('1a','1b','2a','2b','3a','3c'));
PLAYER '1a'_CNT '1b'_CNT '2a'_CNT '2b'_CNT '3a'_CNT '3c'_CNT
---------- ---------- ---------- ---------- ---------- ---------- ----------
aaa 2 1 0 0 0 0
bbb 0 0 1 1 0 0
ddd 1 0 0 0 0 0
ccc 0 0 0 1 0 0
4 rows selected.
Addenda to get NO_PHONES
SQL> SELECT *
2 FROM (SELECT player, game, phone, count( distinct phone) over ( partition by player ) as no_phones
3 FROM t2)
4 PIVOT (count(phone) AS cnt FOR (game) IN ('1a','1b','2a','2b','3a','3c'));
PLAYER NO_PHONES '1a'_CNT '1b'_CNT '2a'_CNT '2b'_CNT '3a'_CNT '3c'_CNT
---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
ccc 1 0 0 0 1 0 0
ddd 2 1 0 0 0 0 0
aaa 3 2 1 0 0 0 0
bbb 2 0 0 1 1 0 0