CREATE TABLE "basketball_match" (
"Team_ID" int,
"School_ID" int,
"Team_Name" text,
"ACC_Regular_Season" text,
"ACC_Percent" text,
"ACC_Home" text,
"ACC_Road" text,
"All_Games" text,
"All_Games_Percent" int,
"All_Home" text,
"All_Road" text,
"All_Neutral" text,
PRIMARY KEY ("Team_ID"),
FOREIGN KEY (`School_ID`) REFERENCES `university`(`School_ID`)
)

CREATE TABLE "university" (
"School_ID" int,
"School" text,
"Location" text,
"Founded" real,
"Affiliation" text,
"Enrollment" real,
"Nickname" text,
"Primary_conference" text,
PRIMARY KEY ("School_ID")
)
SELECT t1.Primary_conference FROM university AS t1 JOIN basketball_match AS t2 ON t1.school_id  =  t2.school_id ORDER BY t2.acc_percent LIMIT 1
Return the primary conference of the school with the lowest acc percentage score.