Database schema:

CREATE TABLE "transaction" (
	"TransactionID" INTEGER -- example: ['100000', '100001'],
	"CreditCardNumber" INTEGER -- example: ['6011583832864739', '4716634257568793'],
	"CustomerID" INTEGER -- example: ['864896', '610766'],
	"TransactionDate" DATE -- example: ['2014-07-07', '2014-07-13'],
	"CreditCardType" TEXT -- example: ['Discover', 'Visa'],
	"LocationID" INTEGER -- example: ['2', '1'],
	"RootBeerID" INTEGER -- example: ['105798', '105661'],
	"PurchasePrice" REAL -- example: ['1.0', '3.0'],
	PRIMARY KEY ("TransactionID"), 
	CONSTRAINT fk_transaction_customers FOREIGN KEY("CustomerID") REFERENCES customers ("CustomerID"),
	CONSTRAINT fk_transaction_location FOREIGN KEY("LocationID") REFERENCES location ("LocationID"),
	CONSTRAINT fk_transaction_rootbeer FOREIGN KEY("RootBeerID") REFERENCES rootbeer ("RootBeerID")
)


CREATE TABLE customers (
	"CustomerID" INTEGER -- example: ['103508', '101811'],
	"First" TEXT -- example: ['Kenneth', 'Madeleine'],
	"Last" TEXT -- example: ['Walton', 'Jones'],
	"StreetAddress" TEXT -- example: ['6715 Commonwealth Dr', '3603 Leola Way'],
	"City" TEXT -- example: ['Sacramento', 'Orangevale'],
	"State" TEXT -- example: ['CA'],
	"ZipCode" INTEGER -- example: ['94256', '94258'],
	"Email" TEXT -- example: ['j_madeleine@gmail.com', 'walton.k76@fastmail.com'],
	"PhoneNumber" TEXT -- example: ['(916) 918-1561', '(916) 186-9423'],
	"FirstPurchaseDate" DATE -- example: ['2013-05-30', '2013-02-06'],
	"SubscribedToEmailList" TEXT -- example: ['FALSE', 'TRUE'],
	"Gender" TEXT -- example: ['M', 'F'],
	PRIMARY KEY ("CustomerID")
)


CREATE TABLE geolocation (
	"LocationID" INTEGER -- example: ['0', '1'],
	"Latitude" REAL -- example: ['0.0', '38.566129'],
	"Longitude" REAL -- example: ['0.0', '-121.426432'],
	PRIMARY KEY ("LocationID"), 
	CONSTRAINT fk_geolocation_location FOREIGN KEY("LocationID") REFERENCES location ("LocationID")
)


CREATE TABLE location (
	"LocationID" INTEGER -- example: ['0', '1'],
	"LocationName" TEXT -- example: ['Sac State American River Courtyard', 'LOST'],
	"StreetAddress" TEXT -- example: ['6000 J St'],
	"City" TEXT -- example: ['Sacramento'],
	"State" TEXT -- example: ['CA'],
	"ZipCode" INTEGER -- example: ['95819'],
	PRIMARY KEY ("LocationID"), 
	CONSTRAINT fk_location_geolocation FOREIGN KEY("LocationID") REFERENCES geolocation ("LocationID")
)


CREATE TABLE rootbeer (
	"RootBeerID" INTEGER -- example: ['100000', '100001'],
	"BrandID" INTEGER -- example: ['10002', '10001'],
	"ContainerType" TEXT -- example: ['Can', 'Bottle'],
	"LocationID" INTEGER -- example: ['2', '1'],
	"PurchaseDate" DATE -- example: ['2015-07-03', '2016-05-09'],
	PRIMARY KEY ("RootBeerID"), 
	CONSTRAINT fk_rootbeer_geolocation FOREIGN KEY("LocationID") REFERENCES geolocation ("LocationID"),
	CONSTRAINT fk_rootbeer_location FOREIGN KEY("LocationID") REFERENCES location ("LocationID"),
	CONSTRAINT fk_rootbeer_rootbeerbrand FOREIGN KEY("BrandID") REFERENCES rootbeerbrand ("BrandID")
)


CREATE TABLE rootbeerbrand (
	"BrandID" INTEGER -- example: ['10002', '10001'],
	"BrandName" TEXT -- example: ['A&W', 'A.J. Stephans'],
	"FirstBrewedYear" INTEGER -- example: ['1919', '1926'],
	"BreweryName" TEXT -- example: ['AJ Stephans Beverages', 'Dr Pepper Snapple Group'],
	"City" TEXT -- example: ['Fall River', 'Lodi'],
	"State" TEXT -- example: ['MA', 'CA'],
	"Country" TEXT -- example: ['Australia', 'United States'],
	"Description" TEXT -- example: ['After setting up the first A&W Root Beer stand in ', 'AJ Stephans Company makes \nthe finest elixirs and '],
	"CaneSugar" TEXT -- example: ['FALSE', 'TRUE'],
	"CornSyrup" TEXT -- example: ['FALSE', 'TRUE'],
	"Honey" TEXT -- example: ['FALSE', 'TRUE'],
	"ArtificialSweetener" TEXT -- example: ['FALSE', 'TRUE'],
	"Caffeinated" TEXT -- example: ['FALSE', 'TRUE'],
	"Alcoholic" TEXT -- example: ['FALSE'],
	"AvailableInCans" TEXT -- example: ['FALSE', 'TRUE'],
	"AvailableInBottles" TEXT -- example: ['FALSE', 'TRUE'],
	"AvailableInKegs" TEXT -- example: ['FALSE', 'TRUE'],
	"Website" TEXT -- example: ['http://www.rootbeer.com/', 'http://www.ajstephans.com/'],
	"FacebookPage" TEXT -- example: ['https://www.facebook.com/Dads-Old-Fashioned-Root-B', 'https://www.facebook.com/Dog-N-Suds-Bottled-Root-B'],
	"Twitter" TEXT -- example: ['https://twitter.com/ilovedads', 'https://twitter.com/1919rootbeer'],
	"WholesaleCost" REAL -- example: ['0.42', '0.98'],
	"CurrentRetailPrice" REAL -- example: ['1.0', '3.0'],
	PRIMARY KEY ("BrandID")
)


CREATE TABLE rootbeerreview (
	"CustomerID" INTEGER -- example: ['105549', '101811'],
	"BrandID" INTEGER -- example: ['10012', '10014'],
	"StarRating" INTEGER -- example: ['5', '1'],
	"ReviewDate" DATE -- example: ['2013-07-15', '2013-07-08'],
	"Review" TEXT -- example: ['You could have done better Sactown.', 'Too much bite, not enough barq.'],
	PRIMARY KEY ("CustomerID", "BrandID"), 
	CONSTRAINT fk_rootbeerreview_customers FOREIGN KEY("CustomerID") REFERENCES customers ("CustomerID"),
	CONSTRAINT fk_rootbeerreview_rootbeerbrand FOREIGN KEY("BrandID") REFERENCES rootbeerbrand ("BrandID")
)

Question: Give me the full name of the first customer, and tell me how long ago he or she wrote his or her first review since making his or her first purchase.
Evidence: full name = First, Last; how long ago = SUBTRACT(ReviewDate, FirstPurchaseDate);

SQL:
SELECT T1.First, T1.Last , strftime('%J', ReviewDate) - strftime('%J', FirstPurchaseDate) AS TIMEAGO FROM customers AS T1 INNER JOIN rootbeerreview AS T2 ON T1.CustomerID = T2.CustomerID LIMIT 1