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# 区间查询函数

## 连续满足区间函数

连续满足条件区间函数用来查询所有满足指定条件的连续区间。

按返回值可分为两类：
1. 返回满足条件连续区间的起始时间戳和时间跨度(时间跨度为0表示此处只有起始时间这一个数据点满足条件)
2. 返回满足条件连续区间的起始时间戳和后面连续满足条件的点的个数（个数为1表示此处只有起始时间这一个数据点满足条件）

| 函数名               | 输入序列类型                               | 属性参数                                           | 输出序列类型 | 功能描述                                                             |
|-------------------|--------------------------------------|------------------------------------------------|-------|------------------------------------------------------------------|
| ZERO_DURATION     | INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN | `min`:可选，默认值0</br>`max`:可选，默认值`Long.MAX_VALUE` | Long  | 返回时间序列连续为0(false)的开始时间与持续时间，持续时间t(单位ms)满足`t >= min && t <= max`  |
| NON_ZERO_DURATION | INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN | `min`:可选，默认值0</br>`max`:可选，默认值`Long.MAX_VALUE` | Long  | 返回时间序列连续不为0(false)的开始时间与持续时间，持续时间t(单位ms)满足`t >= min && t <= max` |               |
| ZERO_COUNT        | INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN | `min`:可选，默认值1</br>`max`:可选，默认值`Long.MAX_VALUE` | Long  | 返回时间序列连续为0(false)的开始时间与其后数据点的个数，数据点个数n满足`n >= min && n <= max`   |               |
| NON_ZERO_COUNT    | INT32/ INT64/ FLOAT/ DOUBLE/ BOOLEAN | `min`:可选，默认值1</br>`max`:可选，默认值`Long.MAX_VALUE` | Long  | 返回时间序列连续不为0(false)的开始时间与其后数据点的个数，数据点个数n满足`n >= min && n <= max`  |               |

测试数据:
```
IoTDB> select s1,s2,s3,s4,s5 from root.sg.d2;
+-----------------------------+-------------+-------------+-------------+-------------+-------------+
|                         Time|root.sg.d2.s1|root.sg.d2.s2|root.sg.d2.s3|root.sg.d2.s4|root.sg.d2.s5|
+-----------------------------+-------------+-------------+-------------+-------------+-------------+
|1970-01-01T08:00:00.000+08:00|            0|            0|          0.0|          0.0|        false|
|1970-01-01T08:00:00.001+08:00|            1|            1|          1.0|          1.0|         true|
|1970-01-01T08:00:00.002+08:00|            1|            1|          1.0|          1.0|         true|
|1970-01-01T08:00:00.003+08:00|            0|            0|          0.0|          0.0|        false|
|1970-01-01T08:00:00.004+08:00|            1|            1|          1.0|          1.0|         true|
|1970-01-01T08:00:00.005+08:00|            0|            0|          0.0|          0.0|        false|
|1970-01-01T08:00:00.006+08:00|            0|            0|          0.0|          0.0|        false|
|1970-01-01T08:00:00.007+08:00|            1|            1|          1.0|          1.0|         true|
+-----------------------------+-------------+-------------+-------------+-------------+-------------+
```

sql:
```sql
select s1, zero_count(s1), non_zero_count(s2), zero_duration(s3), non_zero_duration(s4) from root.sg.d2;
```

结果:
```
+-----------------------------+-------------+-------------------------+-----------------------------+----------------------------+--------------------------------+
|                         Time|root.sg.d2.s1|zero_count(root.sg.d2.s1)|non_zero_count(root.sg.d2.s2)|zero_duration(root.sg.d2.s3)|non_zero_duration(root.sg.d2.s4)|
+-----------------------------+-------------+-------------------------+-----------------------------+----------------------------+--------------------------------+
|1970-01-01T08:00:00.000+08:00|            0|                        1|                         null|                           0|                            null|
|1970-01-01T08:00:00.001+08:00|            1|                     null|                            2|                        null|                               1|
|1970-01-01T08:00:00.002+08:00|            1|                     null|                         null|                        null|                            null|
|1970-01-01T08:00:00.003+08:00|            0|                        1|                         null|                           0|                            null|
|1970-01-01T08:00:00.004+08:00|            1|                     null|                            1|                        null|                               0|
|1970-01-01T08:00:00.005+08:00|            0|                        2|                         null|                           1|                            null|
|1970-01-01T08:00:00.006+08:00|            0|                     null|                         null|                        null|                            null|
|1970-01-01T08:00:00.007+08:00|            1|                     null|                            1|                        null|                               0|
+-----------------------------+-------------+-------------------------+-----------------------------+----------------------------+--------------------------------+
```