How to query the month in oracle? Brief analysis of methods

In Oracle database, querying the month is a very common operation, because many times we need to perform data statistics and analysis based on the month. The method of querying the month is also very simple. You can use some built-in functions or methods in Oracle to achieve this.

1. Use the to_char method to query the month

The to_char function is a very important function in Oracle. It can convert date type data into a string type data and can specify the format. . It is very convenient to query the month using the to_char function. The sample code is as follows:

select to_char(sysdate,'mm') as Month from dual;

In the above code, we use the to_char function to The system's current date (sysdate) is converted into a string type data, and the 'mm' format locator is used to specify the month we want to query. This will get the current month.

2. Use the extract method to query the month

The extract function is a special function that can extract specified parts from a date type data, such as year, month, day, etc. Here we can use the extract function to query the month. The sample code is as follows:

select extract(month from sysdate) as Month from dual;

In the above code, we use the extract function to Extract the month from the current system date (sysdate). This will get the current month.

3. Use the trunc method to query the month

The trunc function is a very useful function in Oracle. It can intercept date type data to a specified number of digits in a specified format. For example, you can Intercept to day, month, year, etc. It is also very simple to use the trunc function to query the month. The sample code is as follows:

select trunc(sysdate,'MONTH') as Month from dual;

In the above code, we use the trunc function The current system date (sysdate) is intercepted to the month. This will get the current month.

Summary:

The above three methods can be used to query the month very conveniently. Which one to use depends on the specific business scenario. In practical applications, we can choose which method to use for querying according to our needs. No matter which method is used, accurate month query can be achieved.

The above is the detailed content of How to query the month in oracle? Brief analysis of methods. For more information, please follow other related articles on the PHP Chinese website!