Create two tables customer_data and order_data in SQL in a single execution via PHP - mysql

Question

CREATE TABLE IF NOT EXISTS customers_data (
id int(20) UNSIGNED AUTO_INCREMENT PRIMARY KEY NOT NULL,
INVOICE_ID varchar(50) NOT NULL,
_NAME varchar(255) NOT NULL,
MOBILE bigint(12) NOT NULL,
GSTIN varchar(20) NOT NULL,
_ADDRESS varchar(255) NOT NULL,
EMAIL varchar(255) NOT NULL,
_STATE varchar(50) NOT NULL,
MODE varchar(10) NOT NULL,
_DATE date NOT NULL DEFAULT current_timestamp(),
total_qty int(11) NOT NULL,
total_amount decimal(40,2) NOT NULL,
total_sc_gst decimal(30,2) NOT NULL,
Round_Off float(2,2) NOT NULL,
grand_total decimal(50,0) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
customer_data created sucessfully.
But there is an error in order_data regarding foreign key. Remember I want to create these two table in a same time.
CREATE TABLE IF NOT EXISTS order_data (
id int(20) UNSIGNED AUTO_INCREMENT PRIMARY KEY NOT NULL,
cus_id int(20) NOT NULL,
ITEM varchar(255) NOT NULL,
HSN varchar(50) NOT NULL,
QTY int(15) NOT NULL,
RATE decimal(40,2) NOT NULL,
S_C_GST decimal(30,2) NOT NULL,
TOTAL decimal(50,2) NOT NULL,
_DATE timestamp NOT NULL DEFAULT current_timestamp(),
FOREIGN KEY(cus_id) REFERENCES customers_data(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
I got this error.
#1005 - Can't create table test. (errno: 150 "Foreign
key constraint is incorrectly formed")

Answer 1

I think you are using MySQL. You have not used Constraint with Foreign Key. Try the below query.
CREATE TABLE IF NOT EXISTS order_data (
id int(20) UNSIGNED AUTO_INCREMENT PRIMARY KEY NOT NULL,
cus_id int(20) NOT NULL,
ITEM varchar(255) NOT NULL,
HSN varchar(50) NOT NULL,
QTY int(15) NOT NULL,
RATE decimal(40,2) NOT NULL,
S_C_GST decimal(30,2) NOT NULL,
TOTAL decimal(50,2) NOT NULL,
_DATE timestamp NOT NULL DEFAULT current_timestamp(),
**CONSTRAINT <FK_NAME>** FOREIGN KEY(cus_id) REFERENCES customers_data(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

Answer 2

Making the table "at the same time" is not the problem you need to solve, (it's not possible anyway).
You can't make a foreign key if the data type is different from the data type of the referenced column.
order_data.cus_id is an INT column.
customers_data.id is an INT UNSIGNED column.
Change either one or the other data type, so they are the same.