lwtdev edited a comment on issue #7548:
URL: https://github.com/apache/shardingsphere/issues/7548#issuecomment-696550564
> Hi @lwtdev
> Thanks for your detailed issue.
> Firstly, I also wonder how you created the `customer` table, which will
help position the problem.
> Secondly, I have to say this is a band example of defensive programming. 😞
Yes, This is not a good config example （and it was wrong...）. it's was a
example simplify from config as follow(in 4.x):
```yaml
databaseStrategy:
inline:
shardingColumn: customer_id
algorithmExpression: ds_${String.format("%02d",new
BigDecimal(customer_id).abs().divideAndRemainder(4)[1].longValue().intdiv(2))}
tableStrategy:
inline:
shardingColumn: customer_id
algorithmExpression: customer_email_${String.format("%04d",new
BigDecimal(customer_id).abs().divideAndRemainder(4)[1].longValue())}
```
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