Ini adalah bagaimana Anda dapat melakukan ini
select @rn:[email protected]+1 as id,colors from (
(select @rn1:= @rn1+1 as rn,colors from table1,(select @rn1:=0)x order by id )
union all
(select @rn2:= @rn2+1 as rn,numbers as colors from table2,(select @rn2:=0.5)x order by id)
union all
(select @rn3:= @rn3+1 as rn,names as colors from table3,(select @rn3:=0.6)x order by id )
)x,(select @rn:=0)y order by rn ;
Idenya adalah untuk menetapkan rn nilai untuk setiap item tabel dan perlu memastikan bahwa nilai-nilai ini selalu dalam urutan menaik
Jadi jika Anda menjalankan kueri untuk setiap tabel, Anda akan memiliki
mysql> select @rn1:= @rn1+1 as rn,colors from table1,(select @rn1:=0)x order by id;
+------+--------+
| rn | colors |
+------+--------+
| 1 | red |
| 2 | green |
| 3 | blue |
| 4 | yellow |
+------+--------+
4 rows in set (0.00 sec)
mysql> select @rn2:= @rn2+1 as rn,numbers as colors from table2,(select @rn2:=0.5)x order by id;
+------+--------+
| rn | colors |
+------+--------+
| 1.5 | ten |
| 2.5 | two |
| 3.5 | one |
| 4.5 | three |
| 5.5 | six |
| 6.5 | five |
+------+--------+
6 rows in set (0.00 sec)
mysql> select @rn3:= @rn3+1 as rn,names as colors from table3,(select @rn3:=0.6)x order by id;
+------+--------+
| rn | colors |
+------+--------+
| 1.6 | jack |
| 2.6 | peter |
+------+--------+
2 rows in set (0.00 sec)
Di sini Anda dapat melihat table1 rn nilainya adalah 1,2,3,.... table2 nilainya adalah 1.5,2.5,3.5,.... table3 nilainya adalah 1.6,2.6,....
jadi akhirnya ketika Anda memesan hasilnya dengan semua rn akan menjadi seperti
1,1.5,1.6,2,2.5,2.6,....
