小编Log*_*gan的帖子

进行左连接后，我留下了许多空值。如何仅在同一查询中的某些列中将这些空值替换为 0？

select 
    m1.*, t2.Apple, t3.Berry, t4.Cherry
from
    table1 as t1
    left join table2 as t2 on t1.id = t2.id
    left join table3 as t3 on t1.id = t3.id
    left join table3 as t4 on t1.id = t4.id
;

示例输出

ID  Apple     Berry    Cheery
1   1         NULL     1
2   1         NULL     NULL
3   NULL      1        NULL
4   NULL      NULL     NULL