10. The Sukkah furniture-Table in Sukkah:
One may not eat in a Sukkah with the table outside the Sukkah. This applies even if the Sukkah is very large. One who does so is considered as if he ate outside the Sukkah.
May part of the table be inside the house?
May one position the table under invalid Sechach that is within the Sukkah?
One is not to do so, although if the Sechach is only Rabbinically invalid then one fulfills his obligation Bedieved.
 Michaber 634:4; Mishneh Sukkah 28a; Piskeiy Teshuvos 634:3
 The reason: As we suspect one may come after his food which is on the table and end up eating outside the Sukkah. [Michaber ibid]
 Shaareiy Tziyon 634:6; Kaf Hachaim 634:11; Piskeiy Teshuvos 634:3
 Chayeh Adam 146:49; M”A 634:2
 Birkeiy Yosef 634:2; See Kinyan Torah 3:83; Az Nidbaru 14:41
 See Bikureiy Yaakov 634:5; Piskeiy Teshuvos 634:3