/*
1 Selection

1.1 Without Index

*/

select count(*) from Roads where Name starts "Univers"

select * from Buildings where GeoData intersects eichlinghofen


/*
1.2 Creating a Standard Index

*/

create index on Roads columns Name

/*
1.3 Using a Standard Index

*/

select count(*) from Roads where Name starts "Univers"

/*
1.4 Creating a Spatial Index

*/

create index on Buildings columns GeoData

/*
1.5 Using a Spatial Index

*/

select * from Buildings where GeoData intersects eichlinghofen

/*
2 Join

2.1 Equijoin

*/

select * from [Natural as n1, Natural as n2] 
where [n1:Name = n2:Name, n1:Osm_id < n2:Osm_id]

/*
2.2 Spatial Join

*/

select count(*) from [Roads as r, Waterways as w] 
where r:GeoData intersects w:GeoData

/*
Expressions in the Select Clause

*/

select [r:Osm_id, r:Name, w:Osm_id, w:Name, 
	intersection(r:GeoData, w:GeoData) as BridgePosition]
from [Roads as r, Waterways as w] 
where r:GeoData intersects w:GeoData

/*
2.3 General Join

*/

select * from [Roads as r, Waterways as w] 
where [r:Name contains w:Name,
	r:Type contains "pedestrian", w:Type contains "river"]


/*
2.4 Index-Based Equijoin

*/

select * from [Roads as r1, Roads]
where [r1:Name = Name, r1:Osm_id < Osm_id, r1:Type contains "raceway"]


/*
2.5 Index-Based Spatial Join

*/

// select count(*) from [Roads as r, Buildings as b] 
// where [distance(gk(r:GeoData), gk(b:GeoData)) < 500, 
//	r:Type contains "raceway"]


/*
3 Aggregation

3.1 Counting

*/

select [Type, count(*) as Cnt]
from Roads
groupby Type


/*
3.2 Sum, Average

*/

select [Type, avg(Width) as AWidth]
from Waterways
where between(Width, 0, 10000)
groupby[Type]