SQL perguntas e respostas de entrevista
Question: What is a join? Explain the different types of joins?Answer: Join is a query, which retrieves related columns or rows from multiple tables.Self Join - Joining the table with itself. Equi Join - Joining two tables by equating two common columns. Non-Equi Join - Joining two tables by equating two common columns. Outer Join - Joining two tables in such a way that query can also retrieve rows that do not have corresponding join value in the other table. |
Salvar para revisao
Adicione este item aos favoritos, marque-o como dificil ou coloque-o em um conjunto de revisao.
Faca login para salvar favoritos, perguntas dificeis e conjuntos de revisao.
Isto e util? Sim Nao
Mais uteis segundo os usuarios: