Multiple times values are coming in mysql - mysql

Question

I have two tables
tbl1 and tbl2
tbl1 table contains 5 columns name id(pk), email , address ,pid(INDEX),status(ENUM Y,N)
tbl2 table contains 3 columns id(pk) ,pid(INDEX),domain
When i am running this query
SELECT *
FROM tbl1 as l
LEFT JOIN tbl2 as m on l.pid=m.pid
WHERE l.status='Y';
It is giving multiple records . Please note we are making join in pid both pid are not primary key. Please help to get only unique values from both table.
enter image description here

Answer 1

You seem to want to join on the basis of relative position in the tables.A way to do this is row_number simulation using variables.
drop table if exists t1,t2;
create table t1(id int, email varchar(5),address varchar(10),pid int,status varchar(1));
create table t2(id int, pid int, domain varchar(5));
insert into t1 values (1,'aa#aa', 'aaaaa',428,'Y'), (2,'bb#bb', 'bbbbb',428,'n'),(3,'cc#cc', 'ccccc',428,'Y') ;
insert into t2 values (1,428,'mmm'),(2,428,'zzz');
select t1.*,t2.*
from
(
select t1.*,
if(t1.pid <> #pid1, #bn1:=#bn1+1,#bn1:=#bn1) BlockNo1,
if(t1.id <> #id1, #rn1:=#rn1+1, #rn1:=1) rowno1,
#pid1:=t1.pid pid1,
#id1:=t1.id p1
from t1
cross join (select #bn1:=0,#rn1:=0, #pid1:=0 ,#id1:=0) r
where status = 'y'
order by t1.pid,t1.id
) t1
join
(
select t2.id t2id,t2.pid t2pid, t2.domain t2domain,
if(t2.pid <> #pid2, #bn2:=#bn2+1,#bn2:=#bn2) BlockNo2,
if(t2.id <> #id2, #rn2:=#rn2+1, #rn2:=1) rowno2,
#pid2:=t2.pid pid2,
#id2:=t2.id p2
from t2
cross join (select #bn2:=0,#rn2:=0, #pid2:=0 ,#id2:=0) r
order by t2.pid,t2.id
) t2 on (t1.blockno1 = t2.blockno2) and (t1.rowno1 = t2.rowno2)
+------+-------+---------+------+--------+----------+--------+------+------+------+-------+----------+----------+--------+------+------+
| id | email | address | pid | status | BlockNo1 | rowno1 | pid1 | p1 | t2id | t2pid | t2domain | BlockNo2 | rowno2 | pid2 | p2 |
+------+-------+---------+------+--------+----------+--------+------+------+------+-------+----------+----------+--------+------+------+
| 1 | aa#aa | aaaaa | 428 | Y | 1 | 1 | 428 | 1 | 1 | 428 | mmm | 1 | 1 | 428 | 1 |
| 3 | cc#cc | ccccc | 428 | Y | 1 | 2 | 428 | 3 | 2 | 428 | zzz | 1 | 2 | 428 | 2 |
+------+-------+---------+------+--------+----------+--------+------+------+------+-------+----------+----------+--------+------+------+
2 rows in set (0.04 sec)