CREATE CONSTRAINT ON (u:`label2`) ASSERT EXISTS (u.`ext2`);
CREATE CONSTRAINT ON (u:`label`) ASSERT EXISTS (u.`ext`);
CREATE CONSTRAINT ON (u:`label`) ASSERT u.`a` IS UNIQUE;
CREATE CONSTRAINT ON (u:`label`) ASSERT u.`b` IS UNIQUE;
CREATE CONSTRAINT ON (u:`label`) ASSERT u.`c` IS UNIQUE;
CREATE CONSTRAINT ON (u:`label2`) ASSERT u.`a`, u.`b` IS UNIQUE;
