How to Efficiently Filter Users by Age Range Using SQLAlchemy Date Fields?

Filtering SQL Data Fields

When working with data in an SQL database, it's often necessary to filter specific fields to retrieve targeted information. In this case, we explore how to filter a field representing dates using SQLAlchemy.

Given the following model:

class User(Base):
    ...
    birthday = Column(Date, index=True)   #in database it's like '1987-01-17'
    ...

Our goal is to filter users based on their birthdays, specifically those within a particular age range, e.g., between 18 and 30 years.

Originally, you attempted to implement the filtering using:

query = DBSession.query(User).filter(
    and_(User.birthday >= '1988-01-17', User.birthday <= '1985-01-17')
)

However, this query is incorrect due to a typo. The proper filter should be:

qry = DBSession.query(User).filter(
    and_(User.birthday <= '1988-01-17', User.birthday >= '1985-01-17')
)

Another alternative for filtering date ranges is the between function:

qry = DBSession.query(User).filter(User.birthday.between('1985-01-17', '1988-01-17'))

By utilizing these filtered queries, you can retrieve specific user records based on their dates of birth, enabling you to perform further operations or analysis on the selected data.

The above is the detailed content of How to Efficiently Filter Users by Age Range Using SQLAlchemy Date Fields?. For more information, please follow other related articles on the PHP Chinese website!