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doc-exports/docs/dws/tool/dws_16_0181.html
luhuayi a5e3903f6b DWS TG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-04-23 13:53:01 +00:00

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Division Expressions

In MySQL, in a division expression, if the divisor is 0, null is returned. GaussDB(DWS) reports an error. Therefore, the division expression is converted by adding an if condition expression.

Input

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select sum(c1) / c2 as result from table_t1;
select sum(c1) / count (c3/c4) as result from table_t1;

Output

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SELECT  (if (c2 = 0, null, sum(c1) / c2)) AS "result" FROM  table_t1;
SELECT  (if (count(if (c4 = 0, null, c3 / c4)) = 0, null, sum(c1) / count(if (c4 = 0, null, c3 / c4)))) AS "result" FROM  table_t1;