sqlite- fetch data from multiple tables together- android and iOS

Question

I have multiple sqlite tables and I want to fetch data from these tables together from Ionic 3 app for android and iOS platform and send it to server

Here's the code I wrote for this functionality

function fetchDataFromSqlite(){
let tableNames = ['table1','table2','table3'];
var dataFromSQLite= {};

for (var i = 0; i < tableNames.length; i++)
{
   let tableName = tableNames[i];
   let queryParams = [1];
   let query = `SELECT * FROM ${tableName} WHERE status= ?`; 
   this.databaseprovider.SelectQry(query, queryParams).then(data => {
     dataFromSQLite[tableName] = data;
   });
  return dataFromSQLite;
}
}

Above function is what I wrote to perform this action. I call this function in my app component

SelectQry() in databaseprovider looks like this:

  SelectQry(sql, params) {
    return this.database.executeSql(sql, params).then(
      data => {
        return data;
      },
      err => {
        console.log("Error: ", JSON.stringify(err));
        return [];
      }
    );
  }

When I alert() the data returned from fetchDataFromSqlite() , I get {}

Can anyone tell me what I'm doing wrong or why I'm not getting any output when there's data in SQLite tables?