Table: regional_eu_gdp
Columns: region_nuts_2006
total_million
per_capita_2005
ppp_million
ppp_per_capita
of_eu_average_gdp_ppp

Question: Where is the PPP 23164 million €?
SQL: SELECT "region_nuts_2006" FROM regional_eu_gdp WHERE "ppp_million" = 23164

Question: What's the total (in million €) in the region where PPP is 21779 million €?
SQL: SELECT "total_million" FROM regional_eu_gdp WHERE "ppp_million" = 21779

Question: What's the percentage of EU average GDP (PPP) in the region where € per capita is 2519
SQL: SELECT "of_eu_average_gdp_ppp" FROM regional_eu_gdp WHERE "per_capita_2005" = 2519