MySQL Data Type Storage Requirements

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What does the '%' wildcard represent in the CREATE USER syntax?

any hostname

What is the password for the user 'John123'?

OpenSesame (hashed)

What is the purpose of the SELECT statement in the given example?

to verify that the users have been created

What is the current state of the users 'John123' and 'John456' in terms of database permissions?

without any permissions Signup and view all the answers

What is the significance of the 'mysql' database in the context of user management?

it stores user information Signup and view all the answers

What is the storage requirement for the `YEAR` data type in MySQL, regardless of the version?

1 byte Signup and view all the answers

How does the storage requirement for the `TIME` data type change as of MySQL 5.6.4?

It adds fractional seconds storage Signup and view all the answers

What is the storage requirement for the `DATETIME` data type as of MySQL 5.6.4?

5 bytes + fractional seconds storage Signup and view all the answers

What is the storage requirement for a `TIMESTAMP` data type with fractional seconds precision of 3?

4 bytes + 2 bytes (for fractional seconds) Signup and view all the answers

How many bytes are required to store fractional seconds with a precision of 5 or 6?

3 bytes Signup and view all the answers

What is the purpose of the table showing fractional seconds precision and storage required?

To determine the storage required for fractional seconds in time values Signup and view all the answers

What is the purpose of the SET statement in the given SQL code snippet?

To set a variable @query that will be used to create a table. Signup and view all the answers

What is the role of the PREPARE statement in the given SQL code?

To prepare the statement from the @query variable. Signup and view all the answers

What is the purpose of the DROP TABLE statement in the given SQL code?

To drop the table part_of_partitioned_table if it exists. Signup and view all the answers

What is the purpose of the EXECUTE statement in the given SQL code?

To execute the statement prepared from the @query variable. Signup and view all the answers

What is the purpose of the row_number column in the SELECT statement?

To assign a unique number to each row in the result set. Signup and view all the answers

What is the purpose of the variable @prev_val in the SELECT statement?

To store the previous value of the team column. Signup and view all the answers

What is the purpose of the IF function in the SELECT statement?

To reset the row_number to 1 when the team changes. Signup and view all the answers

What is the purpose of the ORDER BY clause in the SELECT statement?

To sort the result set by team and person in ascending and descending order respectively. Signup and view all the answers

What is the purpose of the comment '--' in SQL?

To comment out a line of code or add a note to the SQL statement. Signup and view all the answers

What is the difference between '--' and '#' comment types in SQL?

Both '--' and '#' are used to add comments to SQL statements, but '--' requires a space after it. Signup and view all the answers

What happens when you specify the value of the corresponding column for all columns in the table in an INSERT statement?

You can ignore the column list in the INSERT statement. Signup and view all the answers

Why is it good practice to list the fields you are inserting data into within your code?

So that your insert statement doesn't break if new columns are added to the table. Signup and view all the answers

What is the purpose of the AUTO_INCREMENT PRIMARY KEY in a table?

It automatically assigns a unique id to each new row inserted into the table. Signup and view all the answers

Why do you not insert into the AUTO_INCREMENT PRIMARY KEY column when inserting data?

Because the database automatically assigns a unique id to the row. Signup and view all the answers

What is the purpose of the LAST_INSERT_ID() function?

To retrieve the id of the last inserted row. Signup and view all the answers

Why is LAST_INSERT_ID() tied to the session?

So that each session gets its own id, even if multiple connections are inserting into the same table. Signup and view all the answers

What is the primary key in the `iodku` table?

id Signup and view all the answers

What triggers the 'duplicate key' in the `iodku` table?

The UNIQUE key, not the AUTO_INCREMENT PRIMARY KEY. Signup and view all the answers

What is the purpose of the ON DUPLICATE KEY UPDATE clause in the INSERT statement?

To update the existing row if a duplicate key is found. Signup and view all the answers

MySQL Data Type Storage Requirements

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Questions and Answers

What does the '%' wildcard represent in the CREATE USER syntax?

What is the password for the user 'John123'?

What is the purpose of the SELECT statement in the given example?

What is the current state of the users 'John123' and 'John456' in terms of database permissions?

What is the significance of the 'mysql' database in the context of user management?

What is the storage requirement for the YEAR data type in MySQL, regardless of the version?

How does the storage requirement for the TIME data type change as of MySQL 5.6.4?

What is the storage requirement for the DATETIME data type as of MySQL 5.6.4?

What is the storage requirement for a TIMESTAMP data type with fractional seconds precision of 3?