What is the process of creating a nested JSON object using a SQL query string in JavaScript?

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Below is an example of how to create a nested JSON object using a SQL query string in JavaScript:

1. First, execute the SQL query string using a database connection in JavaScript. For example:

const sql = 'SELECT * FROM users';
const users = await database.query(sql);

1. Create an empty object to hold the nested JSON data:

const nestedJson = {};

1. Loop through the results of the SQL query to populate the nested JSON object:

users.forEach(user => {
  if (!nestedJson[user.department]) {
    nestedJson[user.department] = {
      count: 0,
      users: []
    };
  }
  nestedJson[user.department].count++;
  nestedJson[user.department].users.push({
    id: user.id,
    name: user.name,
    email: user.email
  });
});

In this example, the nested JSON object is organized by user department. For each user, we check whether the department already exists in the nestedJson object. If it doesn't, we create a new department object with a count property set to 0 and an empty users array. We then increment the department's count property and push the user details as an object into the users array.

1. Finally, the nested JSON object can be returned or used as needed:

return nestedJson;