move first semester to first semester

I/MTM/task4-straipsnis/init.sql

@@ -0,0 +1,36 @@
+-- schema
+CREATE TABLE airports (
+    gid SERIAL NOT NULL PRIMARY KEY,
+    name TEXT,
+    city TEXT,
+    country TEXT,
+    iata TEXT,
+    icao TEXT,
+    geom GEOMETRY,
+    latitude DOUBLE PRECISION,
+    longitude DOUBLE PRECISION,
+    altitude DOUBLE PRECISION,
+    timezone TEXT,
+    dst TEXT,
+    tz TEXT,
+    type TEXT,
+    source TEXT,
+    CONSTRAINT enforce_dims_geom CHECK (st_ndims(geom) = 3),
+    CONSTRAINT enforce_geotype_geom CHECK (geometrytype(geom) = 'POINT'::text OR geom IS NULL),
+    CONSTRAINT enforce_srid_geom CHECK (st_srid(geom) = 4326)
+);
+-- create index for faster spatial lookups
+CREATE INDEX idx_geom ON airports USING GIN (geom);
+
+-- import data from airports.dat
+\copy airports(gid, name, city, country, iata, icao, latitude, longitude, altitude, timezone, dst, tz, type, source) FROM 'airports.dat' DELIMITERS ',' CSV;
+
+-- put lat/lon/altitude to the "real" geom field
+UPDATE airports
+SET geom = ST_SetSRID(ST_MakePoint(longitude, latitude, altitude * 0.3048),4326);
+
+ALTER TABLE airports DROP COLUMN latitude;
+ALTER TABLE airports DROP COLUMN longitude;
+ALTER TABLE airports DROP COLUMN altitude;
+ALTER TABLE airports DROP COLUMN type;
+ALTER TABLE airports DROP COLUMN source;