Update country table pk

sql/v01/10.create.sql

@@ -19,16 +19,16 @@ CREATE TABLE client_parameter (
 ) STRICT;
 
 CREATE TABLE country (
+    num    INTEGER NOT NULL CHECK (num >= 0),
     alpha2 TEXT    NOT NULL CHECK (alpha2 REGEXP '^[A-Z]{2}$'),
     alpha3 TEXT    NOT NULL CHECK (alpha3 REGEXP '^[A-Z]{3}$'),
-    num    INTEGER NOT NULL CHECK (num >= 0),
     name   TEXT    NOT NULL,
 
-    is_visible INTEGER NOT NULL CHECK (is_visible = TRUE OR is_visible = FALSE) DEFAULT TRUE,
+    is_visible INTEGER NOT NULL CHECK (is_visible IN (TRUE, FALSE)) DEFAULT TRUE,
 
-    CONSTRAINT pk_country PRIMARY KEY (alpha2),
+    CONSTRAINT pk_country PRIMARY KEY (num),
+    CONSTRAINT sk_country_alpha2 UNIQUE (alpha2),
     CONSTRAINT sk_country_alpha3 UNIQUE (alpha3),
-    CONSTRAINT sk_country_numeric UNIQUE (num),
     CONSTRAINT sk_country_name UNIQUE (name)
 ) STRICT;