What is the customer id of the customer who has the most orders?
CREATE TABLE orders (
    order_id number,
    customer_id number,
    order_status text,
    date_order_placed time,
    order_details text
)

CREATE TABLE invoices (
    invoice_number number,
    invoice_date time,
    invoice_details text
)

CREATE TABLE order_items (
    order_item_id number,
    product_id number,
    order_id number,
    order_item_status text,
    order_item_details text
)

CREATE TABLE shipments (
    shipment_id number,
    order_id number,
    invoice_number number,
    shipment_tracking_number text,
    shipment_date time,
    other_shipment_details text
)

CREATE TABLE products (
    product_id number,
    product_name text,
    product_details text
)

CREATE TABLE customers (
    customer_id number,
    customer_name text,
    customer_details text
)

CREATE TABLE shipment_items (
    shipment_id number,
    order_item_id number
)
SELECT T1.customer_id FROM customers AS T1 JOIN orders AS T2 ON T1.customer_id = T2.customer_id GROUP BY T1.customer_id ORDER BY COUNT(*) DESC LIMIT 1
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the customer id of the customer who has the most orders? ### Input: CREATE TABLE orders (
    order_id number,
    customer_id number,
    order_status text,
    date_order_placed time,
    order_details text
)

CREATE TABLE invoices (
    invoice_number number,
    invoice_date time,
    invoice_details text
)

CREATE TABLE order_items (
    order_item_id number,
    product_id number,
    order_id number,
    order_item_status text,
    order_item_details text
)

CREATE TABLE shipments (
    shipment_id number,
    order_id number,
    invoice_number number,
    shipment_tracking_number text,
    shipment_date time,
    other_shipment_details text
)

CREATE TABLE products (
    product_id number,
    product_name text,
    product_details text
)

CREATE TABLE customers (
    customer_id number,
    customer_name text,
    customer_details text
)

CREATE TABLE shipment_items (
    shipment_id number,
    order_item_id number
) ### Response: SELECT T1.customer_id FROM customers AS T1 JOIN orders AS T2 ON T1.customer_id = T2.customer_id GROUP BY T1.customer_id ORDER BY COUNT(*) DESC LIMIT 1