SELECT COUNT(cena) FROM uslugi;

<h6>tekst</h6>
<p>pierwsza <b>linia</b> <br>
Druga linia</p>

CREATE TABLE ksiazka (
 id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
 tytul VARCHAR(200),
 autor SMALLINT UNSIGNED NOT NULL,
 CONSTRAINT `dane` FOREIGN KEY (autor) REFERENCES autorzy(id)
);

var random = new Random();
String pulaZnakow = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ";
int dlPuli = pulaZnakow.Length - 1;
char znak;
string wynik = "";

for (int i = 0; i < 8; i++) {
    znak = pulaZnakow[random.Next(0, dlPuli)];
    wynik += znak;
}

class Animal {
  constructor(name) {
    this.name = name;
  }
  speak() {
    return `${this.name} makes a noise.`;
  }
}

class Dog extends Animal {
  speak() {
    return `${this.name} barks.`;
  }
}

let dog = new Dog('Rex');
console.log(dog.speak());

background: linear-gradient(to right, LightBlue, DarkBlue);