#CREATE TABLE test101(
#  A INT NOT NULL PRIMARY KEY,
#  B INT NOT NULL,
#  C INT NOT NULL,
#  CONSTRAINT "fC" FOREIGN KEY (C) REFERENCES test101(A)
#);
#ALTER TABLE test101 ALTER C SET NULL;
#INSERT INTO test101 VALUES (100, 100, NULL);
[ 1	]
#UPDATE test101 SET C = 100 WHERE C IS NULL;
[ 1	]
#select * from test101;
% sys.test101,	sys.test101,	sys.test101 # table_name
% a,	b,	c # name
% int,	int,	int # type
% 3,	3,	3 # length
[ 100,	100,	100	]
#ALTER TABLE test101 ALTER C SET NOT NULL;
#DROP TABLE test101;
#START TRANSACTION;
#CREATE TABLE "sys"."t1" ("c0" DOUBLE,CONSTRAINT "t1_c0_unique" UNIQUE ("c0"),CONSTRAINT "t1_c0_fkey" FOREIGN KEY ("c0") REFERENCES "sys"."t1" ("c0"));
#ROLLBACK;
#START TRANSACTION;
#CREATE TABLE "t0"("tc0" CHARACTER LARGE OBJECT NOT NULL,CONSTRAINT "t0_tc0_pkey" PRIMARY KEY ("tc0"),
#CONSTRAINT "t0_tc0_fkey" FOREIGN KEY ("tc0") REFERENCES "sys"."t0" ("tc0"));
#ROLLBACK;
#CREATE TABLE t1(c0 FLOAT);
#ALTER TABLE t1 ADD UNIQUE(c0);
#INSERT INTO t1(c0) VALUES(13.38);
[ 1	]
#DELETE FROM t1 WHERE true;
[ 1	]
#INSERT INTO t1(c0) VALUES(0.9), (0.5), (-3), (0.4);
[ 4	]
#ALTER TABLE t1 ADD FOREIGN KEY (c0) REFERENCES t1(c0);
#INSERT INTO t1(c0) VALUES(null);
[ 1	]
#DROP TABLE t1;