promises.js

sql.connect(config.sqlConfig).then(pool => {
    this.pool = pool;
    pool.request().query `select * from dbo.Groups`
})
.then(iSuccesfullyGetGroups.bind(this), errorConnect)
.then(startParsing.bind(this))

function iSuccesfullyGetGroups(result){
  const groups = result.recordset;
  if (groups.length > 0) {
      VK.auth.user().then(token => {
          for (const group of groups) {
              VK.call('execute.getPosts', {
                  mode: "getOffset",
                  groupId: group.GroupId,
                  topicId: group.TopicId
              }).then(res => {
                  console.log(res);
                  return this.pool.request().query `UPDATE dbo.Groups SET offset = ${res.count} WHERE Id = ${group.Id}`
              }).catch(err => {});
          }
      });
  }
}

function startParsing(pool) {
    setInterval(() => {
      pool.request().query(`select * from dbo.Groups`).then(successGetGroups.bind(this));
    }, 5000);
}