Вещественный тип данных sql

DROP TABLE "Species" IF EXISTS;
DROP TABLE "Series" IF EXISTS;
DROP TABLE "Section" IF EXISTS;
DROP TABLE "Subgenus" IF EXISTS;
DROP TABLE "Genus" IF EXISTS;
DROP TABLE "Subfamily" IF EXISTS;
DROP TABLE "Family" IF EXISTS;
 
 
CREATE TABLE "Family" (
    "Fml_ID" REAL NOT NULL,
    "Name_Fml" VARCHAR(50) NOT NULL,
    CONSTRAINT "K1" PRIMARY KEY ("Fml_ID")
);
 
CREATE TABLE "Subfamily" (
    "Sbf_ID" REAL NOT NULL,
    "Name_Sbf" VARCHAR(50),
    "Fml_ID" REAL NOT NULL,
    CONSTRAINT "K2" PRIMARY KEY ("Sbf_ID"),
    CONSTRAINT "С1" FOREIGN KEY ("Fml_ID")
    REFERENCES "Family" ("Fml_ID")
);
 
CREATE TABLE "Genus" (
    "Gn_ID" INTEGER NOT NULL,
    "Name_Gn" VARCHAR(50) NOT NULL,
    "Sbf_ID" REAL NOT NULL,
    CONSTRAINT "K3" PRIMARY KEY ("Gn_ID"),
    CONSTRAINT "С2" FOREIGN KEY ("Sbf_ID")
    REFERENCES "Subfamily" ("Sbf_ID")
);
 
CREATE TABLE "Subgenus" (
    "Sbn_ID" INTEGER NOT NULL,
    "Name_Sbn" VARCHAR(50),
    "Gn_ID" INTEGER NOT NULL,
    CONSTRAINT "K4" PRIMARY KEY ("Sbn_ID"),
    CONSTRAINT "С3" FOREIGN KEY ("Gn_ID")
    REFERENCES "Genus" ("Gn_ID")
);
 
CREATE TABLE "Section" (
    "Stn_ID" INTEGER NOT NULL,
    "Name_Stn" VARCHAR(50),
    "Sbn_ID" INTEGER NOT NULL,
    CONSTRAINT "K5" PRIMARY KEY ("Stn_ID"),
    CONSTRAINT "С4" FOREIGN KEY ("Sbn_ID")
    REFERENCES "Subgenus" ("Sbn_ID")
);
 
CREATE TABLE "Series" (
    "Srs_ID" INTEGER NOT NULL,
    "Name_Srs" VARCHAR(50),
    "Stn_ID" INTEGER NOT NULL,
    CONSTRAINT "K6" PRIMARY KEY ("Srs_ID"),
    CONSTRAINT "С5" FOREIGN KEY ("Stn_ID")
    REFERENCES "Section" ("Stn_ID")
);
 
CREATE TABLE "Species" (
    "Spc_ID" INTEGER PRIMARY KEY,
    "Name_Spc" VARCHAR(50),
    "Srs_ID" INTEGER NOT NULL,
    "Equator_d" REAL,
    "Polar_axis" REAL,
    "Laesura_long" REAL,
    "Laesura_wide" REAL,
    "Roller_like" REAL,
    "Tubercle_along_l" REAL,
    "Equatorial_ridge" REAL,
    "Equator_ridge_proximal" REAL,
    "Equator_ridge_distal" REAL,
    "Tubercle_proximal" REAL,
    "Tubercle_distal" REAL,
    "Folds_proximal" REAL,
    "Folds_distal" REAL,
    "Form_spore" VARCHAR(50),
    "Form_distal_side" VARCHAR(50),
    "Form_proximal_side" VARCHAR(50),
    "Surface_exosporium" VARCHAR(50),
    CONSTRAINT "K7" PRIMARY KEY ("Spc_ID"),
    CONSTRAINT "С6" FOREIGN KEY ("Srs_ID")
    REFERENCES "Series" ("Srs_ID")
);
 
INSERT INTO "Family" ("Fml_ID", "Name_Fml") VALUES ('1', 'Pteridaceae')
INSERT INTO "Subfamily" ("Sbf_ID", "Name_Sbf", "Fml_ID") VALUES ('1', 'Cryptogrammoideae', '1')
INSERT INTO "Genus" ("Gn_ID", "Name_Gn", "Sbf_ID") VALUES ('1', 'Actiniopteris', '1')
INSERT INTO "Subgenus" ("Sbn_ID", "Name_Sbn", "Gn_ID") VALUES ('1', '', '1')
INSERT INTO "Section" ("Stn_ID", "Name_Stn", "Sbn_ID") VALUES ('1', '', '1')
INSERT INTO "Series" ("Srs_ID", "Name_Srs", "Stn_ID") VALUES ('1', '', '1')
INSERT INTO "Species" ("Spc_ID", "Name_Spc", "Srs_ID") VALUES ('1', 'Actiniopteris australis', '1')
INSERT INTO "Species" ("Equator_d", "Polar_axis", "Laesura_long", "Laesura_wide", "Roller_like", "Tubercle_along_l", "Equatorial_ridge") VALUES (49.9, 0.0, 25.8, 2.2, 0.0, '', 4.1)
INSERT INTO "Species" ("Equator_ridge_proximal", "Equator_ridge_distal", "Tubercle_proximal", "Tubercle_distal", "Folds_proximal", "Folds_distal") VALUES (0.0, '', 3.0, 0.0, 0.0, 4.8)
INSERT INTO "Species" ("Form_spore", "Form_distal_side", "Form_proximal_side", "Surface_exosporium") VALUES ()