CREATE TABLE table_22903426_1 (scm_system VARCHAR2, windows_builders VARCHAR2)

Name the number of scm system for nant, visual studio
SELECT COUNT(scm_system) FROM table_22903426_1 WHERE windows_builders = "NAnt, Visual Studio"
SELECT COUNT("scm_system") FROM "table_22903426_1" WHERE "NAnt, Visual Studio" = "windows_builders"