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%';
Increase the salary of each instructor in the Comp. Sci. department by 10%. update instructorset salary = salary * 1.10where dept name = 'Comp.
SELECT id, name, city FROM persons JOIN (SELECT city FROM persons GROUP BY city HAVING count(*) > 1) AS cities USING (city); This might be the most performant solution.
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.
The following will increase the salaries of all the employees to 10% in the Employee table using a single UPDATE statement. UPDATE Employee SET Salary = Salary + (Salary * 10/100); Now, the Select * from Employee query will display the following result.
What does the following query do? Explanation: student. branch = department. branch verifies whether both the values of the attributes are same in both the relations and returns the value.
With SQL, how do you select all the columns from a table named "Persons"?Click the icon SQL Worksheet. The SQL Worksheet pane appears.In the field under "Enter SQL Statement:", enter this query: SELECT * FROM SLIGHTBOOK;Click the Execute Statement. The query runs.Click the tab Results.
1. select FirstName +' '+ MiddleName +' ' + Lastname as Name from TableName.
The DESC command is used to sort the data returned in descending order.
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.
Use the COUNT aggregate function to count the number of rows in a table. This function takes the name of the column as its argument (e.g., id ) and returns the number of rows for this particular column in the table (e.g., 5).
the number of rowsCOUNT(*) returns the number of rows in a specified table, and it preserves duplicate rows. It counts each row separately. This includes rows that contain null values.
The COUNT(*) function returns the number of orders for each customerid . The HAVING clause gets only groups that have more than 20 orders.
A self join is a join in which a table is joined with itself (which is also called Unary relationships), especially when the table has a FOREIGN KEY which references its own PRIMARY KEY. To join a table itself means that each row of the table is combined with itself and with every other row of the table.
The SQL Not Equal comparison operator (!=) is used to compare two expressions. For example, 15 !=
The first step is to use the GROUP BY clause to create the groups (in our example, we group by the country column). Then, in the ORDER BY clause, you use the aggregate function COUNT, which counts the number of values in the column of your choice; in our example, we count distinct IDs with COUNT(id) .