Sesiones de PyR

Anybody explain the below lines in simple language so that i can understand.
//sql
1 Voto
1 Respuesta
10th Apr 2017, 7:40 PM
T Karthikeyan
T Karthikeyan - avatar
What is the difference b/w unique and primary key?
//sqlconstraints
4 Votos
2 Respuestas
10th Apr 2017, 4:54 PM
T Karthikeyan
T Karthikeyan - avatar
En tendencia hoy
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