CREATE TABLE table_29615165_5 (_percentage_0_19_years VARCHAR2, quartier VARCHAR2)

How many o-19% are where the quartier is in saint-loup?
SELECT _percentage_0_19_years FROM table_29615165_5 WHERE quartier = "Saint-Loup"
SELECT "_percentage_0_19_years" FROM "table_29615165_5" WHERE "Saint-Loup" = "quartier"