SELECT t1.customer_name FROM customers AS t1 JOIN customers_policies AS t2 ON t1.customer_id  =  t2.customer_id GROUP BY t1.customer_name ORDER BY count(*) DESC LIMIT 1
Which customer uses the most policies? Give me the customer name.
CREATE TABLE Customers (
Customer_ID INTEGER NOT NULL,
Customer_name VARCHAR(40),
PRIMARY KEY (Customer_ID)
);
CREATE TABLE Services (
Service_ID INTEGER NOT NULL,
Service_name VARCHAR(40),
PRIMARY KEY (Service_ID)
);
CREATE TABLE Available_Policies (
Policy_ID INTEGER NOT NULL,
policy_type_code CHAR(15),
Customer_Phone VARCHAR(255),
PRIMARY KEY (Policy_ID),
UNIQUE (Policy_ID)
);
CREATE TABLE Customers_Policies (
Customer_ID INTEGER NOT NULL,
Policy_ID INTEGER NOT NULL,
Date_Opened DATE,
Date_Closed DATE,
PRIMARY KEY (Customer_ID, Policy_ID),
FOREIGN KEY (Customer_ID) REFERENCES Customers (Customer_ID),
FOREIGN KEY (Policy_ID) REFERENCES Available_Policies (Policy_ID)
);
CREATE TABLE First_Notification_of_Loss (
FNOL_ID INTEGER NOT NULL,
Customer_ID INTEGER NOT NULL,
Policy_ID INTEGER NOT NULL,
Service_ID INTEGER NOT NULL,
PRIMARY KEY (FNOL_ID),
UNIQUE (FNOL_ID),
FOREIGN KEY (Service_ID) REFERENCES Services (Service_ID),
FOREIGN KEY (Customer_ID, Policy_ID) REFERENCES Customers_Policies (Customer_ID,Policy_ID)
);
CREATE TABLE Claims (
Claim_ID INTEGER NOT NULL,
FNOL_ID INTEGER NOT NULL,
Effective_Date DATE,
PRIMARY KEY (Claim_ID),
UNIQUE (Claim_ID),
FOREIGN KEY (FNOL_ID) REFERENCES First_Notification_of_Loss (FNOL_ID)
);
CREATE TABLE Settlements (
Settlement_ID INTEGER NOT NULL,
Claim_ID INTEGER,
Effective_Date DATE,
Settlement_Amount REAL,
PRIMARY KEY (Settlement_ID),
UNIQUE (Settlement_ID),
FOREIGN KEY (Claim_ID) REFERENCES Claims (Claim_ID)
);
INSERT INTO `Customers` (`Customer_ID`, `Customer_name`) VALUES (194, 'America Jaskolski');
INSERT INTO `Services` (`Service_ID`, `Service_name`) VALUES (1, 'New policy application');
INSERT INTO `Available_Policies` (`Policy_ID`, `policy_type_code`, `Customer_Phone`) VALUES (246, 'Life Insurance', '+16(2)5838999222');
INSERT INTO `Customers_Policies` (`Customer_ID`, `Policy_ID`, `Date_Opened`, `Date_Closed`) VALUES (214, 257, '2016-11-19', '2018-03-04');
INSERT INTO `First_Notification_of_Loss` (`FNOL_ID`, `Customer_ID`, `Policy_ID`, `Service_ID`) VALUES (532, 214, 257, 6);
INSERT INTO `Claims` (`Claim_ID`, `FNOL_ID`, `Effective_Date`) VALUES (134, 1722, '1973-08-18');
INSERT INTO `Settlements` (`Settlement_ID`, `Claim_ID`, `Effective_Date`, `Settlement_Amount`) VALUES (161, 717, '2009-11-20', '6451.65');