Q6) Which of the following query will find all the unique students who have taken more than one course? Option D would be a right option. This query will first apply self join on enrolled table and then it evaluate the condition e1. sid = e2.
To get the number of students who are registered for more than 5 courses you do this... SELECT COUNT(*) FROM REGISTRATION WHERE SEMESTER = 'GIVEN SEMESTER' GROUP BY CAMPUS, STUDENT_ID HAVING COUNT(*) > 5; You need to group by campus AND student id since student id is repeated for different campuses.
SQL SELECT Statement Examples In its most simple form, the SELECT clause has the following SQL syntax for a Microsoft SQL Server database: SELECT * FROM
In SQL we can retrieve data from multiple tables also by using SELECT with multiple tables which actually results in CROSS JOIN of all the tables.
How to select all data from student table starting the name from letter 'r'?A. SELECT * FROM student WHERE name LIKE 'r%';SELECT * FROM student WHERE name LIKE '%r%';SELECT * FROM student WHERE name LIKE '%r';SELECT * FROM student WHERE name LIKE '_r%';
Answer. Answer: Which of the Query is used to Select all the Students from City = "Pune".
The SQL SELECT Statement The SELECT statement is used to select data from a database. The data returned is stored in a result table, called the result-set.
Select all records from a table. A special character asterisk * is used to address all the data(belonging to all columns) in a query. SELECT statement uses * character to retrieve all records from a table, for all the columns.
An asterisk (" * ") can be used to specify that the query should return all columns of the queried tables. SELECT is the most complex statement in SQL, with optional keywords and clauses that include: The FROM clause, which indicates the table(s) to retrieve data from.
In SQL, to fetch data from multiple tables, the join operator is used. The join operator adds or removes rows in the virtual table that is used by SQL server to process data before the other steps of the query consume the data.
You can replace the JOIN keyword with a comma in the FROM clause. What do you do next? There's no ON keyword for you to state the joining condition as there would be when using JOIN , e.g., on which two columns you want to join the tables. In this method, you simply use a WHERE clause to do so.
Run SELECT table_name FROM information_schema. ... Open a new spreadsheet and copy the table list into column "A" of the sheet starting at row 1.Test your query first in a single table, then when ready, copy the query to column "B" row 1. ... Select cell B1 and fill the string formula down to match the number of table names.More items...•
SQL SELECT COUNT(DISTINCT column_name) SELECT COUNT(DISTINCT column_name) counts the total number of distinct values of column in the table. Refer this guide – SQL DISTINCT to learn more about SQL SELECT DISTINCT statement. Query: Lets take the same table STUDENT that we have taken in the above example.
Here, we will see how to query to find the employees whose departments are not assigned by using the following SQL query as follows. SELECT* FROM employee WHERE emp_dept IS NULL; Output : In this table, all the employee records whose department is NULL value are obtained.
An aggregate function can be used in a WHERE clause only if that clause is part of a subquery of a HAVING clause and the column name specified in the expression is a correlated reference to a group. If the expression includes more than one column name, each column name must be a correlated reference to the same group.
To get the last record, the following is the query. mysql> select *from getLastRecord ORDER BY id DESC LIMIT 1; The following is the output. The above output shows that we have fetched the last record, with Id 4 and Name Carol.
SELECT query is used to retrieve data from a table. It is the most used SQL query. We can retrieve complete table data, or partial by specifying conditions using the WHERE clause.
The above query will show all the records of student table, that means it will show complete dataset of the table.
So you can also perform simple mathematical operations on the data too using the SELECT query to fetch data from table.