How can I perform advanced queries using Sequelize in Node.js?

How can I perform advanced queries using Sequelize in Node.js?

You can perform advanced queries in Sequelize using methods like findAll, findOne, and raw queries. What specific query are you looking to implement?

I want to do a complex join between two tables and filter the results.

You can use the include option in your query to join tables. For example:

const results = await ModelA.findAll({
  include: [{
    model: ModelB,
    where: { someField: someValue }
  }]
});

This will join ModelA with ModelB and filter based on someField.

What if I need to aggregate data from those tables?

You can use Sequelize's group and attributes options to aggregate data. For example:

const results = await ModelA.findAll({
  include: [{ model: ModelB }],
  attributes: [[Sequelize.fn('COUNT', Sequelize.col('ModelB.id')), 'count']],
  group: ['ModelA.id']
});

This will count the number of related ModelB entries for each ModelA.

Can I also sort the results?

Yes, you can sort the results using the order option. For example:

const results = await ModelA.findAll({
  include: [{ model: ModelB }],
  order: [['createdAt', 'DESC']]
});

This will sort the results by the createdAt field in descending order.