Is it true or false? The main key field must have unique key values for each entry in order to support indexed sequential access.
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Is it true or false? The main key field must have unique key values for each entry in order to support indexed sequential access.
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- CREATE DATABASE COUNTRIES; USE COUNTRIES; DROP TABLE IF EXISTS `City`; CREATE TABLE `City` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `Name` char(35) NOT NULL DEFAULT '', `CountryCode` char(3) NOT NULL DEFAULT '', `District` char(20) NOT NULL DEFAULT '', `Population` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`ID`) ) ENGINE=MyISAM AUTO_INCREMENT=4080 DEFAULT CHARSET=latin1; -- -- Dumping data for table `City` -- -- ORDER BY: `ID` INSERT INTO `City` VALUES (1,'Kabul','AFG','Kabol',1780000); INSERT INTO `City` VALUES (2,'Qandahar','AFG','Qandahar',237500); INSERT INTO `City` VALUES (3,'Herat','AFG','Herat',186800); INSERT INTO `City` VALUES (4,'Mazar-e-Sharif','AFG','Balkh',127800); INSERT INTO `City` VALUES (5,'Amsterdam','NLD','Noord-Holland',731200); INSERT INTO `City` VALUES (6,'Rotterdam','NLD','Zuid-Holland',593321); INSERT INTO `City` VALUES (7,'Haag','NLD','Zuid-Holland',440900); INSERT INTO `City` VALUES (3068,'Berlin','DEU','Berliini',3386667); INSERT INTO `City` VALUES…class Database:def __init__(self, db_name):self.db = sqlite3.connect(db_name)self.cursor = self.db.cursor()def create_table(self, table_schema):self.cursor.execute(table_schema)self.db.commit()def insert_data(self, table_name, data):for i in range(len(data)):keys = ", ".join(data.columns)values = ", ".join([f"'{value}'" if pd.isna(value) else str(value) for value in data.iloc[i]])self.cursor.execute(f"INSERT INTO {table_name} ({keys}) VALUES ({values})")self.db.commit()def search_data(self, table_name, year):self.cursor.execute(f"SELECT * FROM {table_name} WHERE year={year}")result = self.cursor.fetchone()if result is not None:return resultelse:return Nonedef delete_data(self, table_name, year):self.cursor.execute(f"DELETE FROM {table_name} WHERE year={year}")self.db.commit()return self.cursor.rowcount > 0 Please rewrite (or convert) the code above with format: def QueryBuilder( Data_Base, Query_Type, Query_Tuple):'''''' Build Query_String'''''' return Query_String10. Write another function called db_consistent that takes a dictionary of dictionariesin the format described in the previous question and returns Trueif and only if every one of the inner dictionaries has exactly the same keys.(This function would return False for the previous example, since RosalindFranklin's entry doesn't contain the 'author' key.)
- Write a stored procedure named updateUnitsOnOrder(). The updateUnitsOnOrder ()procedure should update the UnitsOnOrder field of those products that are discontinued. It should set the UnitsOnOrder field to 99 for those discontinued products. Hint: There is no need to use cursor processing for this stored procedure.Chapter 16 How to manage transactions and locking Excercises using the My Guitar Shop Database Use Microsoft SQL Server Write a script that includes two SQL statements coded as a transaction to delete the row with a customer ID of 8 from the Customers table. To do this, you must first delete all addresses for that customer from the Addresses table. If these statements execute successfully, commit the changes. Otherwise, roll back the changes.Suppose you have the following information: Name ID GPA sami 102 90 sara 550 66 A. Define a CLIPS template "student" to represent the elements name, id, gpa. B. Add the two records to the database. Your answer
- calculate_new_balance Given a starting balance (a number), and a list of transaction tuples, calculate the final balance for an account. Transaction tuples are of the shape ("description", amount, "withdrawal") , or ("description", amount, "deposit"). The last entry in the tuple will be either "withdrawal" or "deposit". Every withdrawal decreases the balance of the account by the specified amount, and every deposit increases the balance. The return value is the new account balance, as a number. (which could be negative) Sample calls should look like: >>> calculate_new_balance(100, [("payday", 20, "deposit"), ("new shoes", 50, "withdrawal"), ("illicit winnings", 200, "deposit")])270>>> calculate_new_balance(100, [])100please find: indexes examined and value returnedExercise 3: Simple login system Create a static dictionary with a number of users and with the following values : first name Last name Email address Password Ask the user for : 5. Email address 6. Password Loop ( for ()) through the dictionary and if ( if ()) the user is found print the following : 7. Hello , first name last name you have successfully logged in 8. Notify the user if the password and email address are wrong 9. Additional challenge : if you want the program to keep asking for a username and password when the combination is wrong, you will need a while () loop.
- individual characters using their 0-based index. Hint: You will need to do this for checking all the rules. However, when you access a character .Task 1: The InstantRide Management team founded a new team for car maintenance. The new team is responsible for the small maintenance operations for the cars in the InstantRide system. The main idea is to take actions faster and minimize the time spent for the maintenance. Therefore, the Car Maintenance team wants to store MAINTENACE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team.Answer the following prompts 1The InstantRide Management team founded a new team for car maintenance. The new team is responsible for the small maintenance operations for the cars in the InstantRide system. The main idea is to take actions faster and minimize the time spent for the maintenance. Therefore, the Car Maintenance team wants to store MAINTENANCE_TYPE_ID (char(5)) and a MAINTENANCE_TYPE_DESCRIPTION (varchar(30)) in the database. Using MAINTENANCE_TYPE_ID as the PRIMARY KEY, create a new table, MAINTENANCE_TYPES, and send the table description with the column names and types to the Car Maintenance team. 2The Car Maintenance team also wants to store the actual maintenance operations in the database. The team wants to start with a table to store CAR_ID (CHAR(5)), MAINTENANCE_TYPE_ID (CHAR(5)) and MAINTENANCE_DUE (DATE) date for the operation. Create a new table named MAINTENANCES. The PRIMARY_KEY should be the combination of the three fields. The CAR_ID and MAINTENANCE_TYPE_ID…