src/UserGuide/latest-Table/SQL-Manual/QuickStart-Only-Sql_apache.md

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# QuickStart Only SQL

> **Before executing the following SQL statements, please ensure**
>
> * **IoTDB service has been successfully started**
> * **Connected to IoTDB via Cli client**
>
> Note: If your terminal does not support multi-line pasting (e.g., Windows CMD), please adjust the SQL statements to single-line format before execution.

## 1. Database Management

```SQL
-- Create database database1, and set the database TTL time to 1 year;
CREATE DATABASE IF NOT EXISTS database1;

-- Use database database1;
USE database1;

-- Modify the database TTL time to 1 week;
ALTER DATABASE database1 SET PROPERTIES TTL=604800000;

-- Delete database database1;
DROP DATABASE IF EXISTS database1;
```

For detailed syntax description, please refer to: [Database Management](../Basic-Concept/Database-Management_apache.md)

## 2. Table Management

```SQL
-- Create table table1;
CREATE TABLE table1 (
  time TIMESTAMP TIME,
  device_id STRING TAG,
  maintenance STRING ATTRIBUTE COMMENT 'maintenance',
  temperature FLOAT FIELD COMMENT 'temperature',
  status Boolean FIELD COMMENT 'status'
);

-- View column information of table table1;
DESC table1 DETAILS;

-- Modify table;
-- Add column to table table1;
ALTER TABLE table1 ADD COLUMN IF NOT EXISTS humidity FLOAT FIELD COMMENT 'humidity';
-- Set table table1 TTL to 1 week;
ALTER TABLE table1 set properties TTL=604800000;

-- Delete table table1;
DROP TABLE table1;
```

For detailed syntax description, please refer to: [Table Management](../Basic-Concept/Table-Management_apache.md)

## 3. Data Writing

```SQL
-- Single row writing;
INSERT INTO table1(device_id, time, temperature) VALUES ('100', '2025-11-26 13:37:00', 90.0);

-- Multi-row writing;
INSERT INTO table1(device_id, maintenance, time, temperature) VALUES 
  ('101', '180', '2024-11-26 13:37:00', 88.0),
  ('100', '180', '2024-11-26 13:38:00', 85.0),
  ('101', '180', '2024-11-27 16:38:00', 80.0);
```

For detailed syntax description, please refer to: [Data Writing](../Basic-Concept/Write-Updata-Data_apache.md#_1-data-insertion)

## 4. Data Query

```SQL
-- Full table query;
SELECT * FROM table1;

-- Function query;
SELECT count(*), sum(temperature) FROM table1;

-- Query data for specified device and time period;
SELECT * 
FROM table1 
WHERE time >= 2024-11-26 00:00:00  and time <= 2024-11-27 00:00:00 and device_id='101';
```

For detailed syntax description, please refer to: [Data Query](../Basic-Concept/Query-Data_apache.md)

## 5. Data Update

```SQL
-- Update the maintenance attribute value for data where device_id is 100;
UPDATE table1 SET maintenance='45' WHERE device_id='100';
```

For detailed syntax description, please refer to: [Data Update](../Basic-Concept/Write-Updata-Data_apache.md#_2-data-updates)

## 6. Data Deletion

```SQL
-- Delete data for specified device and time period;
DELETE FROM table1 WHERE time >= 2024-11-26 23:39:00  and time <= 2024-11-27 20:42:00 AND device_id='101';

-- Full table deletion;
DELETE FROM table1;
```

For detailed syntax description, please refer to: [Data Deletion](../Basic-Concept/Delete-Data.md)