If you're on this page, it's probably because you've got an SQL interview coming up— and JOIN clauses will almost certainly make an appearance. Before the big day, be sure to carefully study the different types of JOIN clauses and be prepared to answer JOIN-centric questions from your...
SQL Interview Question 面试的时候发现会问一些SQL的基本问题,在此总结一下。 ProgramInterview/SQL这个网站上的问题还比较全。 1. Join type INNER JOIN: Returns all rows when there is at least one match in BOTH tables LEFT JOIN: Return all rows from the left table, and the matched rows from the...
1.表连接与差值计算：熟悉 `left join`、`right join`、`inner join` 和 `outer join` 的区别，并...
SQL Job Interview Questions Table of Contents: What is SQL (Structured Query Language)? What is the SQL*Plus? What is NVL? What is a Character Functions? What is SET? What is a TTITLE & BTITLE? What is sql BREAK? What is sql JOIN? What is sql COMPUTE? What is SQL*Loader? What...
Right join:In MySQL, the use of the right join is done to return all the rows from the tables that are on the right side. There is another criterion that it should satisfy. That is the compatibility of the data in the left column with the data in the right column. ...
14. Explain Self-Join with an Example The self-join meansjoining one table with itself. We can use the Self-Join on a table only if it has a column (we will call it A) that serves as the primary key and another column (that we will call Y) that stores values that can correspond...
SQL JOIN's http://www.softwaretestingclass.com/sql-joins/ The JOIN is very much misunderstood term for beginners while learning the SQL commands. In the interview at least one question is ask about the SQL JOIN’s. So in this article I am trying to simplify the things for new SQL ...
There was an interesting question once asked during an interview for SQL skills which looks like the below: "Which is the simplest type of join and which is the most generic type of join statement?" Though its evident that the answer to the former one is CROSS JOIN you might have...
1、join不同的表格求两列之间的差值，知道left，right，inner，outer join的区别 2、运用CASE根据已有的...
32. What is Cross-Join? Cross join defines as Cartesian product where number of rows in the first table multiplied by number of rows in the second table. If suppose, WHERE clause is used in cross join then the query will work like an INNER JOIN....