Which is more effective? daily, weekly, monthly or yearly promotions? how?

I think that is the best annual promotions

And quite a sudden promotions

Resulting from employee excellence in the completion of the work has been

It depends on the product that you sell and your marketing and sales strategies.

For example, fresh food products need daily promotions. Cloths may need seasonal promotions. 

It’s clear that discounts increase sales; this has been well established. However, be sure to proceed with caution if you decide to discount. There can be a downside to discounting too much or even once. If you discount only once, know that customers will ask for more. Apple is a company that rarely discounts their products. Even if they do, it’s not well publicized (with the exception of Black Friday2012).

There’s the obvious disadvantage for brands that discount – customers will shop with you only when you have discounts. A company like Kohl’s is always running a promotional discount. Many of their customers likely shop because they see a discount, even if the discounted price actually is equal to the retail price of a retail store like Target.

Other companies not like Kohl’s offer discounts at seemingly random intervals. In this scenario, customers are more likely to shop only when they get a discount. They might “wait” until you have another sale.

The other big issue with discounts is customers may ask for them even when you’re not running any. This can happen with brands that run discounts and those that don’t.

The main lesson: Tread carefully when discounting. It can boost sales temporarily but lead to issues after the discounts are final.

Adjusting the strategies in accordance with the strategies adopted by competitors.

Adopt it only required in consideration of the near proximity of other shops and markets.

Do the promotions mainly  during the Festive Seasons, as it sounds some justification.

Many products need promotions to market, Many not at all required. 

Locational advantage/disadvantage determine the need for promotions.

Agree with expert answers.