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# 数据增删

## 1. 数据写入

**语法：**

```SQL
INSERT INTO <TABLE_NAME> [(COLUMN_NAME[, COLUMN_NAME]*)]? VALUES (COLUMN_VALUE[, COLUMN_VALUE]*)
```

更多详细语法说明请参考：[写入语法](../Basic-Concept/Write-Updata-Data_apache.md#_1-1-语法)

**示例一：指定列写入**

```SQL
INSERT INTO table1(region, plant_id, device_id, time, temperature, humidity) VALUES ('北京', '1001', '100', '2025-11-26 13:37:00', 90.0, 35.1);

INSERT INTO table1(region, plant_id, device_id, time, temperature) VALUES ('北京', '1001', '100', '2025-11-26 13:38:00', 91.0);
```

**示例二：空值写入**

上述部分列写入等价于如下的带空值写入
```SQL
INSERT INTO table1(region, plant_id, device_id, model_id, maintenance, time, temperature, humidity) VALUES ('北京', '1001', '100', null, null, '2025-11-26 13:37:00', 90.0, 35.1);

INSERT INTO table1(region, plant_id, device_id, model_id, maintenance, time, temperature, humidity) VALUES ('北京', '1001', '100', null, null, '2025-11-26 13:38:00', 91.0, null);
```

**示例三：多行写入**

```SQL
INSERT INTO table1
VALUES 
('2025-11-26 13:37:00', '北京', '1001', '100', 'A', '180', 90.0, 35.1, true, '2025-11-26 13:37:34'),
('2025-11-26 13:38:00', '北京', '1001', '100', 'A', '180', 90.0, 35.1, true, '2025-11-26 13:38:25');

INSERT INTO table1
(region, plant_id, device_id, model_id, maintenance, time, temperature, humidity, status, arrival_time) 
VALUES 
('北京', '1001', '100', 'A', '180', '2025-11-26 13:37:00', 90.0, 35.1, true, '2025-11-26 13:37:34'),
('北京', '1001', '100', 'A', '180', '2025-11-26 13:38:00', 90.0, 35.1, true, '2025-11-26 13:38:25');
```

**示例四：查询写回**

```SQL
insert into target_table select time,region,device_id,temperature from table1 where region = '北京';

insert into target_table(time,device_id,temperature) table table3;

insert into target_table (select t1.time, t1.region as region, t1.device_id as device_id, t1.temperature as temperature from table1 t1 where t1.time in (select t2.time from table2 t2 where t2.region = '上海'));
```

## 2. 数据更新

**语法：**

```SQL
UPDATE <TABLE_NAME> SET updateAssignment (',' updateAssignment)* (WHERE where=booleanExpression)?

updateAssignment
    : identifier EQ expression
    ;
```

更多详细语法说明请参考：[更新语法](../Basic-Concept/Write-Updata-Data_apache.md#_2-1-语法)

**示例：**

```SQL
update table1 set b = a where substring(a, 1, 1) like '%';
```

## 3. 数据删除

**语法:**

```SQL
DELETE FROM <TABLE_NAME> [WHERE_CLAUSE]?

WHERE_CLAUSE:
    WHERE DELETE_CONDITION

DELETE_CONDITION:
    SINGLE_CONDITION
    | DELETE_CONDITION AND DELETE_CONDITION
    | DELETE_CONDITION OR DELETE_CONDITION

SINGLE_CODITION:
    TIME_CONDITION | ID_CONDITION

TIME_CONDITION:
    time TIME_OPERATOR LONG_LITERAL

TIME_OPERATOR:
    < | > | <= | >= | =

ID_CONDITION:
    identifier = STRING_LITERAL
```

**示例一: 删除全表数据**

全表删除
```SQL
DELETE FROM table1;
```

**示例二：删除一段时间范围内的数据**

单时间段数据删除
```SQL
DELETE FROM table1 WHERE time <= 2024-11-29 00:00:00;
```
多时间段数据删除
```SQL
DELETE FROM table1  WHERE time >= 2024-11-27 00:00:00  and time <= 2024-11-29 00:00:00;
```

**示例三：删除指定设备的数据**

删除指定设备的数据
```SQL
DELETE FROM table1 WHERE device_id='101' and model_id = 'B';
```
删除指定设备及时间段的数据
```SQL 
DELETE FROM table1 
    WHERE time >= 2024-11-27 16:39:00  and time <= 2024-11-29 16:42:00 
    AND device_id='101' and model_id = 'B';
```
删除指定类型设备的数据
```SQL
DELETE FROM table1 WHERE model_id = 'B';
```

## 4. 设备删除

**语法：**

```SQL
DELETE DEVICES FROM tableName=qualifiedName (WHERE booleanExpression)?
```

**示例：删除指定设备及其相关的所有数据**

```SQL
DELETE DEVICES FROM table1 WHERE device_id = '101';
```