2

ワンカウント条件の場合に動作させる方法を知っています。複数の条件で機能させるにはどうすればよいですか?

SELECT count(TableName.DeviceName where DeviceName like 'AR%' ) as DEVICE_Type_A,
       count(TableName.DeviceName where DeviceName like 'R%' ) as DEVICE_Type_B,
       count(TableName.DeviceName where DeviceName like 'P%' ) as DEVICE_Type_C,
       count(TableName.DeviceName where DeviceName like 'AM%' ) as DEVICE_Type_D,
  FROM DB.TableName TableName
 WHERE TableName.DURATIONMIN > '180'
4

2 に答える 2

11

case ステートメントを使用する必要があります。

SELECT count(case when DeviceName like 'AR%' then 1 end) as DEVICE_Type_A,
       count(case when DeviceName like 'R%' then 1 end) as DEVICE_Type_B,
       count(case when DeviceName like 'P%' then 1 end) as DEVICE_Type_C,
       count(case when DeviceName like 'AM%' then 1 end) as DEVICE_Type_D
FROM DB.TableName TableName
WHERE TableName.DURATIONMIN > '180'

カウントは残しました。個人的には、「合計」の方がわかりやすいと思います。

SELECT sum(case when DeviceName like 'AR%' then 1 else 0 end) as DEVICE_Type_A,
       sum(case when DeviceName like 'R%' then 1 else 0 end) as DEVICE_Type_B,
       sum(case when DeviceName like 'P%' then 1 else 0 end) as DEVICE_Type_C,
       sum(case when DeviceName like 'AM%' then 1 else 0 end) as DEVICE_Type_D
FROM DB.TableName TableName
WHERE TableName.DURATIONMIN > '180'
于 2012-07-09T18:50:02.237 に答える
1

サブセレクトを使用する必要があります。

SELECT 
    (SELECT count(*) form TableName.DeviceName where DeviceName like 'AR%' ) as DEVICE_Type_A,
    (SELECT count(*) from TableName.DeviceName where DeviceName like 'R%' ) as DEVICE_Type_B,
    (SELECT count(*) from TableName.DeviceName where DeviceName like 'P%' ) as DEVICE_Type_C,
    (SELECT count(*) from TableName.DeviceName where DeviceName like 'AM%' ) as DEVICE_Type_D,
FROM DB.TableName TableName
WHERE TableName.DURATIONMIN > '180'
于 2012-07-09T18:32:38.597 に答える