SELECT SUM("Interval") AS "TotalRunningTime" FROM "M01_OEE" WHERE "Device" = 'M01' AND "Status" = 'Running' 幫我解釋
时间: 2024-06-16 11:01:52 浏览: 115
这个SQL查询语句是用来从名为"M01_OEE"的数据表中计算特定条件下的总运行时间。具体来说:
- `SELECT SUM("Interval") AS "TotalRunningTime"`:这条语句的意思是选择列"Interval"(这很可能表示设备运行时间的单位,如秒)并对其进行求和操作,结果将被命名为"TotalRunningTime",这样查询结果就只有一行,显示总运行时间。
- `FROM "M01_OEE"`:这部分指定了数据来源,即"M01_OEE"这张表。
- `WHERE "Device" = 'M01' AND "Status" = 'Running'`:这是过滤条件,它只包括设备名为'M01'且运行状态为'Running'的记录。这意味着最终结果只计算M01设备在运行期间的总运行时间。
简而言之,这个查询是为了获取设备M01在运行状态下的累计运行时间。如果你想知道更详细的信息,比如运行时间的具体单位、时间范围或如何将结果整合到其他分析中,可以继续提问。
相关问题
select DISTINCT COLLECT_TIME, PERF_VALUE, t1.unit, RULEA, RULEB, RULEC from ( select COLLECT_TIME, PERF_VALUE, UNIT as unit, EQP_OBJ_ID, OBJECT_TYPE, INDEX_TYPE, DEVICE_ID, INDEX_NAME from t_perf_sensor_history tpsh, t_perf_defined tpd where PERF_OBJ_ID = tpd.OBJ_ID ) as t1 left join t_alarm_rule tar on IF(tar.ALARM_OBJECT_TYPE = t1.DEVICE_ID, tar.ALARM_OBJECT_TYPE = t1.DEVICE_ID, tar.ALARM_OBJECT_TYPE = OBJECT_TYPE) where 1=1 and COLLECT_TIME BETWEEN DATE_SUB(NOW(), INTERVAL 62 DAY) AND now() order by COLLECT_TIME desc 怎末改才能避免重复数据
你可以在select子句中使用DISTINCT关键字去除重复数据,例如:
```
select DISTINCT COLLECT_TIME, PERF_VALUE, t1.unit, RULEA, RULEB, RULEC
from (
select COLLECT_TIME, PERF_VALUE, UNIT as unit, EQP_OBJ_ID, OBJECT_TYPE, INDEX_TYPE, DEVICE_ID, INDEX_NAME
from t_perf_sensor_history tpsh, t_perf_defined tpd
where PERF_OBJ_ID = tpd.OBJ_ID
) as t1
left join t_alarm_rule tar on IF(tar.ALARM_OBJECT_TYPE = t1.DEVICE_ID, tar.ALARM_OBJECT_TYPE = t1.DEVICE_ID, tar.ALARM_OBJECT_TYPE = OBJECT_TYPE)
where 1=1 and COLLECT_TIME BETWEEN DATE_SUB(NOW(), INTERVAL 62 DAY) AND now()
order by COLLECT_TIME desc
```
另外,你也可以使用 GROUP BY 子句来去除重复数据,例如:
```
select COLLECT_TIME, PERF_VALUE, t1.unit, RULEA, RULEB, RULEC
from (
select COLLECT_TIME, PERF_VALUE, UNIT as unit, EQP_OBJ_ID, OBJECT_TYPE, INDEX_TYPE, DEVICE_ID, INDEX_NAME
from t_perf_sensor_history tpsh, t_perf_defined tpd
where PERF_OBJ_ID = tpd.OBJ_ID
) as t1
left join t_alarm_rule tar on IF(tar.ALARM_OBJECT_TYPE = t1.DEVICE_ID, tar.ALARM_OBJECT_TYPE = t1.DEVICE_ID, tar.ALARM_OBJECT_TYPE = OBJECT_TYPE)
where 1=1 and COLLECT_TIME BETWEEN DATE_SUB(NOW(), INTERVAL 62 DAY) AND now()
group by COLLECT_TIME, PERF_VALUE, t1.unit, RULEA, RULEB, RULEC
order by COLLECT_TIME desc
```
注意,使用 GROUP BY 语句时需要将 select 子句中的每个非聚合列都包含在 GROUP BY 子句中。
SELECT * FROM T_DWD_FACT_BENEFIT_PRODUCT_PLAN WHERE DATE=TO_DATE('20241001');日期在减少1天
这个SQL查询语句是用来从名为"T_DWD_FACT_BENEFIT_PRODUCT_PLAN"的数据表中获取所有列(通过`*`通配符),条件是在日期字段上等于指定的日期 '2024年10月1日'。但是,如果你想要减少一天,你需要在日期处理部分做出调整。在Oracle数据库中,你可以使用`ADD_MONTHS()`函数或者直接减去一天,假设`DATE`是一个允许日期减法的字段:
```sql
SELECT *
FROM T_DWD_FACT_BENEFIT_PRODUCT_PLAN
WHERE DATE = ADD_MONTHS(TO_DATE('20241001'), -1);
```
如果`DATE`是不允许直接减一天的固定长度日期类型,比如`DATE`类型,那么你可能需要转换它:
```sql
SELECT *
FROM T_DWD_FACT_BENEFIT_PRODUCT_PLAN
WHERE DATE = TO_DATE('20241001', 'YYYYMMDD') - INTERVAL '1' DAY;
```
请注意,上述SQL依赖于你的数据库管理系统支持的函数和语法。
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