MySQL perguntas e respostas de entrevista
Test your skills through the online practice test: MySQL Quiz Online Practice Test
Pergunta 16. What Is Row?
A row is a unit of data with related data items stored as one item in one column in a table.
Isto e util?
Adicionar comentario
Ver comentarios
Pergunta 17. What Is Primary Key?
A primary key is a single column or multiple columns defined to have unique values that can be used as row identifications.
Isto e util?
Adicionar comentario
Ver comentarios
Pergunta 18. What Is Foreign Key?
A foreign key is a single column or multiple columns defined to have values that can be mapped to a primary key in another table.
Isto e util?
Adicionar comentario
Ver comentarios
Pergunta 19. What Is Index?
An index is a single column or multiple columns defined to have values pre-sorted to speed up data retrieval speed.
Isto e util?
Adicionar comentario
Ver comentarios
Pergunta 20. What Is View?
A view is a logical table defined by a query statement.
Isto e util?
Adicionar comentario
Ver comentarios
Mais uteis segundo os usuarios: