Question

此查询的最后部分有些麻烦。

我要寻找的是capcap

如果capValue = 1，则表示我正在寻找3或更大的期望CapValue。

SELECT instanceName, capacitySizeName, desiredCapacitySizeName, desiredCapValue, capvalue FROM
(SELECT instance_name AS instanceName, capacity_size_name AS capacitySizeName, 
(CASE capacity_size_name WHEN 'small' THEN '1' WHEN 'medium' THEN '2' WHEN 'large' THEN '3' WHEN 'xlarge' THEN '4' WHEN 'xxlarge' THEN '5' WHEN 'mega' THEN '6' WHEN 'ultra' THEN '7' WHEN 'giga' THEN '8' WHEN 'tera' THEN '9' WHEN 'peta' THEN '10' END) AS `capValue`, 
u_desired_capacity_size_name AS desiredCapacitySizeName, 
CASE u_desired_capacity_size_name WHEN 'small' THEN '1' WHEN 'medium' THEN '2' WHEN 'large' THEN '3' WHEN 'xlarge' THEN '4' WHEN 'xxlarge' THEN '5' WHEN 'mega' THEN '6' WHEN 'ultra' THEN '7' WHEN 'giga' THEN '8' WHEN 'tera' THEN '9' WHEN 'peta' THEN '10' END AS `desiredCapValue` 
FROM mysql_view 
WHERE used_for = 'Production')A 
WHERE capvalue < desiredCapValue+2 LIMIT 10

谢谢！

Answer 1

您需要数字（而不是字符串）来进行有效的算术评估和正确的Capvalue

  SELECT instanceName
    , capacitySizeName
    , desiredCapacitySizeName
    , desiredCapValue
    , capvalue 
  FROM ( 
      SELECT instance_name AS instanceName
      , capacity_size_name AS capacitySizeName
      ,  (CASE capacity_size_name 
            WHEN 'small' THEN 1 
            WHEN 'medium' THEN 2 
            WHEN 'large' THEN 3 
            WHEN 'xlarge' THEN 4
            WHEN 'xxlarge' THEN 5 
            WHEN 'mega' THEN 6 
            WHEN 'ultra' THEN 7 
            WHEN 'giga' THEN 8 
            WHEN 'tera' THEN 9 
            WHEN 'peta' THEN 10 END) AS `capValue`
      , u_desired_capacity_size_name AS desiredCapacitySizeName
      , CASE u_desired_capacity_size_name 
            WHEN 'small' THEN 1 
            WHEN 'medium' THEN 2 
            WHEN 'large' THEN 3 
            WHEN 'xlarge' THEN 4 
            WHEN 'xxlarge' THEN 5 
            WHEN 'mega' THEN 6 
            WHEN 'ultra' THEN 7
            WHEN 'giga' THEN 8 
            WHEN 'tera' THEN 9 
            WHEN 'peta' THEN 10 END AS `desiredCapValue` 
  FROM mysql_view 
  WHERE used_for = 'Production'
  ) A 
  WHERE capvalue < desiredCapValue+2 
  LIMIT 10

选择名称，其中案例值>另一个案例值+ 2

1 个答案: