Full edition for scientific use. In an Austria-wide online survey, the teaching and learning situation during the Corona-related school closures was surveyed from the perspective of teachers: What learning content, tasks, communication channels are used? How do teachers assess the learning situation and the learning success of their students? To what extent do they succeed in reaching students, where do they see the greatest challenges, and how are they personally doing? Against the background of social selectivity, a focus was placed on the situation of disadvantaged students and differences within classes. The survey was conducted using an online questionnaire at two survey dates when schools were closed due to the pandemic in 2020: first wave in May 2020 with a qualified response of 4019, second wave in late November/early December 2020 with a qualified response of 3708.