Common methods of collecting data are

Common data collection methods: questionnaire survey, field survey, web crawler, data API, database query.

1, questionnaire

Questionnaire survey is a commonly used data collection method. By designing questions and answers, they are distributed to the target population in the form of questionnaires to collect their views, opinions and information. The questionnaire can collect a large amount of data in a short time, but attention should be paid to the design of the questionnaire and the representativeness of the target population.

2. Field test

On-the-spot investigation is a method to understand a specific problem or situation in depth, and it is usually necessary to send investigators to the scene to investigate. Field investigation can collect some data that are difficult to obtain through direct observation, interviews and other means.

3. Web crawler

Web crawler is a tool for automatically collecting data by using computer programs. Through programming, the computer can automatically visit a specific website, get the information on the website and save it in the database. Web crawler can collect a large amount of data quickly, but it needs to pay attention to the accuracy and reliability of the data.

4. Data API

Data API is an interface connecting data sources and data users through the Internet, so that data users can easily obtain the required data. For example, the weather forecasting API can provide real-time weather information, allowing developers to integrate weather forecasting functions in their applications.

5, database query

Database query is a method to obtain the required information by querying the data in the database. This method is usually suitable for data collection and management in enterprises and institutions, and can help decision makers better understand the operation and market demand of enterprises.