CREATE TABLE table_45893 ("Technology" TEXT, "\\u03b7  ( % ) " FLOAT, "V OC  ( V ) " TEXT, "I SC  ( A ) " TEXT, "W/m\\u00b2" TEXT, "t  ( \\u00b5m ) " FLOAT)

What is the sum of t ( m), when Technology is MJ?
SELECT SUM("t (\u00b5m)") FROM table_45893 WHERE "Technology" = 'mj'
SELECT SUM("t (\u00b5m)") FROM "table_45893" WHERE "Technology" = 'mj'