### Database Schema:
CREATE TABLE people (
	`Customer ID`	TEXT	NULL	PRIMARY KEY,
	`Customer Name`	TEXT	NULL,
	Segment	TEXT	NULL,
	Country	TEXT	NULL,
	City	TEXT	NULL,
	State	TEXT	NULL,
	`Postal Code`	INTEGER	NULL,
	Region	TEXT	NULL	PRIMARY KEY
);

CREATE TABLE south_superstore (
	`Row ID`	INTEGER	NULL	PRIMARY KEY,
	`Order ID`	TEXT	NULL,
	`Order Date`	DATE	NULL,
	`Ship Date`	DATE	NULL,
	`Ship Mode`	TEXT	NULL,
	`Customer ID`	TEXT	NULL,
	Region	TEXT	NULL,
	`Product ID`	TEXT	NULL,
	Sales	REAL	NULL,
	Quantity	INTEGER	NULL,
	Discount	REAL	NULL,
	Profit	REAL	NULL,
	foreign key (`Product ID`) references product (`Product ID`),
	foreign key (`Customer ID`) references people (`Customer ID`),
	foreign key (Region) references product (Region),
	foreign key (Region) references people (Region)
);

CREATE TABLE west_superstore (
	`Row ID`	INTEGER	NULL	PRIMARY KEY,
	`Order ID`	TEXT	NULL,
	`Order Date`	DATE	NULL,
	`Ship Date`	DATE	NULL,
	`Ship Mode`	TEXT	NULL,
	`Customer ID`	TEXT	NULL,
	Region	TEXT	NULL,
	`Product ID`	TEXT	NULL,
	Sales	REAL	NULL,
	Quantity	INTEGER	NULL,
	Discount	REAL	NULL,
	Profit	REAL	NULL,
	foreign key (Region) references people (Region),
	foreign key (`Customer ID`) references people (`Customer ID`),
	foreign key (Region) references product (Region),
	foreign key (`Product ID`) references product (`Product ID`)
);

CREATE TABLE product (
	`Product ID`	TEXT	NULL	PRIMARY KEY,
	`Product Name`	TEXT	NULL,
	Category	TEXT	NULL,
	`Sub-Category`	TEXT	NULL,
	Region	TEXT	NULL	PRIMARY KEY
);

CREATE TABLE east_superstore (
	`Row ID`	INTEGER	NULL	PRIMARY KEY,
	`Order ID`	TEXT	NULL,
	`Order Date`	DATE	NULL,
	`Ship Date`	DATE	NULL,
	`Ship Mode`	TEXT	NULL,
	`Customer ID`	TEXT	NULL,
	Region	TEXT	NULL,
	`Product ID`	TEXT	NULL,
	Sales	REAL	NULL,
	Quantity	INTEGER	NULL,
	Discount	REAL	NULL,
	Profit	REAL	NULL,
	foreign key (`Product ID`) references product (`Product ID`),
	foreign key (`Customer ID`) references people (`Customer ID`),
	foreign key (Region) references product (Region),
	foreign key (Region) references people (Region)
);

CREATE TABLE central_superstore (
	`Row ID`	INTEGER	NULL	PRIMARY KEY,
	`Order ID`	TEXT	NULL,
	`Order Date`	DATE	NULL,
	`Ship Date`	DATE	NULL,
	`Ship Mode`	TEXT	NULL,
	`Customer ID`	TEXT	NULL,
	Region	TEXT	NULL,
	`Product ID`	TEXT	NULL,
	Sales	REAL	NULL,
	Quantity	INTEGER	NULL,
	Discount	REAL	NULL,
	Profit	REAL	NULL,
	foreign key (`Product ID`) references product (`Product ID`),
	foreign key (Region) references product (Region),
	foreign key (Region) references people (Region),
	foreign key (`Customer ID`) references people (`Customer ID`)
);

### User's Query:
What product category got the least sales in the west superstore?

### Extra Knowledge:
least sales refers to Sales = MIN(Sales)
SELECT T2.Category FROM west_superstore AS T1 INNER JOIN product AS T2 ON T1.`Product ID` = T2.`Product ID` ORDER BY T1.Sales LIMIT 1