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fix latest point query command in data query #765

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Merged
CritasWang merged 1 commit into from
May 29, 2025
Merged

fix latest point query command in data query #765

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15 changes: 7 additions & 8 deletions src/UserGuide/Master/Table/Basic-Concept/Query-Data.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -139,7 +139,6 @@ IoTDB> SELECT time, temperature, humidity
Total line number = 7
It costs 0.106s
```

**Example 3:Multi device time aligned query**

```SQL
Expand Down Expand Up @@ -196,20 +195,20 @@ It costs 0.278s
**Example**: Retrieve the latest record for each `device_id`, including the temperature value and the timestamp of the last record.

```SQL
IoTDB> SELECT device_id,last(temperature),last_by(time,temperature)
IoTDB> SELECT device_id,last(time),last_by(temperature,time)
FROM table1
GROUP BY device_id;
```

**Result**:

```SQL
+---------+-----+-----------------------------+
|device_id|_col1| _col2|
+---------+-----+-----------------------------+
| 100| 90.0|2024-11-29T18:30:00.000+08:00|
| 101| 90.0|2024-11-30T14:30:00.000+08:00|
+---------+-----+-----------------------------+
+---------+-----------------------------+-----+
|device_id| _col1|_col2|
+---------+-----------------------------+-----+
| 100|2024-11-29T18:30:00.000+08:00| 90.0|
| 101|2024-11-30T14:30:00.000+08:00| 90.0|
+---------+-----------------------------+-----+
Total line number = 2
It costs 0.090s
```
Expand Down
14 changes: 7 additions & 7 deletions src/UserGuide/latest-Table/Basic-Concept/Query-Data.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -195,20 +195,20 @@ It costs 0.278s
**Example**: Retrieve the latest record for each `device_id`, including the temperature value and the timestamp of the last record.

```SQL
IoTDB> SELECT device_id,last(temperature),last_by(time,temperature)
IoTDB> SELECT device_id,last(time),last_by(temperature,time)
FROM table1
GROUP BY device_id;
```

**Result**:

```SQL
+---------+-----+-----------------------------+
|device_id|_col1| _col2|
+---------+-----+-----------------------------+
| 100| 90.0|2024-11-29T18:30:00.000+08:00|
| 101| 90.0|2024-11-30T14:30:00.000+08:00|
+---------+-----+-----------------------------+
+---------+-----------------------------+-----+
|device_id| _col1|_col2|
+---------+-----------------------------+-----+
| 100|2024-11-29T18:30:00.000+08:00| 90.0|
| 101|2024-11-30T14:30:00.000+08:00| 90.0|
+---------+-----------------------------+-----+
Total line number = 2
It costs 0.090s
```
Expand Down
14 changes: 7 additions & 7 deletions src/zh/UserGuide/Master/Table/Basic-Concept/Query-Data.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -197,20 +197,20 @@ It costs 0.278s
**示例：查询表中每个 `device_id` 返回最后一条记录，包含该记录的温度值以及在该设备中基于时间和温度排序的最后一条记录。**

```SQL
IoTDB> SELECT device_id,last(temperature),last_by(time,temperature)
IoTDB> SELECT device_id,last(time),last_by(temperature,time)
FROM table1
GROUP BY device_id;
```

执行结果如下：

```SQL
+---------+-----+-----------------------------+
|device_id|_col1| _col2|
+---------+-----+-----------------------------+
| 100| 90.0|2024-11-29T18:30:00.000+08:00|
| 101| 90.0|2024-11-30T14:30:00.000+08:00|
+---------+-----+-----------------------------+
+---------+-----------------------------+-----+
|device_id| _col1|_col2|
+---------+-----------------------------+-----+
| 100|2024-11-29T18:30:00.000+08:00| 90.0|
| 101|2024-11-30T14:30:00.000+08:00| 90.0|
+---------+-----------------------------+-----+
Total line number = 2
It costs 0.090s
```
Expand Down
14 changes: 7 additions & 7 deletions src/zh/UserGuide/latest-Table/Basic-Concept/Query-Data.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -197,20 +197,20 @@ It costs 0.278s
**示例：查询表中每个 `device_id` 返回最后一条记录，包含该记录的温度值以及在该设备中基于时间和温度排序的最后一条记录。**

```SQL
IoTDB> SELECT device_id,last(temperature),last_by(time,temperature)
IoTDB> SELECT device_id,last(time),last_by(temperature,time)
FROM table1
GROUP BY device_id;
```

执行结果如下：

```SQL
+---------+-----+-----------------------------+
|device_id|_col1| _col2|
+---------+-----+-----------------------------+
| 100| 90.0|2024-11-29T18:30:00.000+08:00|
| 101| 90.0|2024-11-30T14:30:00.000+08:00|
+---------+-----+-----------------------------+
+---------+-----------------------------+-----+
|device_id| _col1|_col2|
+---------+-----------------------------+-----+
| 100|2024-11-29T18:30:00.000+08:00| 90.0|
| 101|2024-11-30T14:30:00.000+08:00| 90.0|
+---------+-----------------------------+-----+
Total line number = 2
It costs 0.090s
```
Expand Down