表数据三行数据4,8,16。满足不等式4x+8y+16z > 100,x+y+z最小,sql实现写法
时间: 2023-06-17 19:03:02 浏览: 137
可以使用SQL的聚合函数和GROUP BY子句来实现这个问题。
首先,我们需要生成所有满足条件的x、y、z组合记录,可以使用CROSS JOIN语句实现:
```
SELECT x, y, z
FROM (SELECT 4 as x) t1
CROSS JOIN (SELECT 8 as y) t2
CROSS JOIN (SELECT 16 as z) t3
WHERE 4*x + 8*y + 16*z > 100;
```
接着,我们对每个组合计算x+y+z的值,并按照这个值进行排序,选取最小的一组即可:
```
SELECT x, y, z, x+y+z as sum_xyz
FROM (SELECT 4 as x) t1
CROSS JOIN (SELECT 8 as y) t2
CROSS JOIN (SELECT 16 as z) t3
WHERE 4*x + 8*y + 16*z > 100
GROUP BY x, y, z
ORDER BY sum_xyz ASC
LIMIT 1;
```
这样就可以得到最小的x+y+z组合。
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