How do I join EMP and department tables in SQL?
Create the EMP table which has a foreign key reference to the DEPT table. The foreign key will require that the DEPTNO in the EMP table exist in the DEPTNO column in the DEPT table. Table created. Insert row into DEPT table using named columns.
What is the relation between EMP and DEPT?
To determine the name of an employee’s department, you compare the value in the DEPTNO column in the EMP table with the DEPTNO values in the DEPT table. The relationship between the EMP and DEPT table is an equijoin – that is, values in the DEPTNO column on both tables must be equal.
How do you display information on the EMP table?
A)Select * from emp where empno in ( select mgr from emp) ; 7. List the emps who joined before 1981. A) select * from emp where hiredate < (’01-jan-81′); 8. List the Empno, Ename, Sal, Daily sal of all emps in the asc order of Annsal.
What is MGR in EMP table?
The MGR attribute contains the employee number of the employee who manages that employee. If the employee has no manager, then the MGR column for that employee is left set to null. The HIREDATE column stores the date on which the employee joined the company.
What is the correct form of SELECT all record from EMP table?
Which of the below SELECT statement is used to select all columns of EMP table? Answer: C. The character ‘*’ is used to select all the columns of the table.
Which query will create the Cartesian product of the tables EMP and DEPT?
The SQL CROSS JOIN produces a result set which is the number of rows in the first table multiplied by the number of rows in the second table if no WHERE clause is used along with CROSS JOIN. This kind of result is called as Cartesian Product. If WHERE clause is used with CROSS JOIN, it functions like an INNER JOIN.
How do I get an employee table in SQL?
The basic syntax for creating a table with the other table is:
- CREATE TABLE table_name AS.
- SELECT column1, column2,…
- FROM old_table_name WHERE ….. ;
- The following SQL creates a copy of the employee table.
- CREATE TABLE EmployeeCopy AS.
- SELECT EmployeeID, FirstName, Email.
- FROM Employee;
How do I count the number of employees Department wise in SQL?
Introduction to SQL COUNT function You can use the COUNT function in the SELECT statement to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc. The result of the COUNT function depends on the argument that you pass to it.
How do you query data from a table?
Use the SELECT statement to query data from a table. Specify one or more column names after the SELECT clause to which you want to query data. Specify the name of the table from which you want to query data.
How do I query all rows in SQL?
SELECT * FROM ; This SQL query will select all columns and all rows from the table. For example: SELECT * FROM [Person].
What is the Cartesian product in SQL?
In SQL Server, the cartesian product is really a cross-join which returns all the rows in all the tables listed in a query: each row in the first table is paired with all the rows in the second table. This happens when there is no relationship defined between the two tables. An Example.
What is SQL Crossjoin?
The CROSS JOIN is used to generate a paired combination of each row of the first table with each row of the second table. This join type is also known as cartesian join.
What is the correct form of select all record from EMP table?
How do I find all employees under each manager in SQL?
Find All Direct Subordinates Under Each Manager manager_id = sup. employee_id .
WHERE can I find department wise COUNT in SQL?
You can use the COUNT function in the SELECT statement to get the number of employees, the number of employees in each department, the number of employees who hold a specific job, etc. The result of the COUNT function depends on the argument that you pass to it.
How do I view 10 rows in SQL?
SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause
- SQL Server / MS Access Syntax: SELECT TOP number|percent column_name(s) FROM table_name.
- MySQL Syntax: SELECT column_name(s) FROM table_name.
- Oracle 12 Syntax: SELECT column_name(s)
- Older Oracle Syntax: SELECT column_name(s)
- Older Oracle Syntax (with ORDER BY): SELECT *
How do I query last 5 records in SQL?
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- You need to count number of rows inside table ( say we have 12 rows )
- then subtract 5 rows from them ( we are now in 7 )
- select * where index_column > 7 select * from users where user_id > ( (select COUNT(*) from users) – 5) you can order them ASC or DESC.