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%';
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.
SolutionCreating student table. ... Describe the structure of the table. ... Insert few records into student table. ... Add column to the student table (that is phone_no). ... Modify the column name of phone_no to student_no. ... Rename the table name to student_info. ... Delete any records from the table.
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.
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 rows that satisfy the WHERE clause of a SELECT statement.
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.
Step-by-Step Instructions to Create Student Database in ExcelStep 1: Enter Data for Student. ... Step 2: Launch Student Data Correctly. ... Step 3: Make Grade Distribution Description. ... Step 4: Excel SUM Function to Aggregate Total Marks for Each Student. ... Step 5: Find out Percentage. ... Step 6: Discover Grade of Each Student.More items...•
Create a database in AccessOpen Access. If Access is already open, select File > New.Select Blank database, or select a template.Enter a name for the database, select a location, and then select Create. If needed, select Enable content in the yellow message bar when the database opens.
Creating Tables mysql> show tables; To create a table for students in this class we can do: mysql> CREATE TABLE student (lastName VARCHAR(20), firstName VARCHAR(20), -> major VARCHAR(20), bDay DATE); The format for the DATE is YYYY-MM-DD.
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) .