CREATE TABLE "reactor_summary" (
  "unit" text,
  "type" text,
  "net_power" text,
  "total_power" text,
  "finish_construction" text
);

Question: Which type had the unit greifswald - 7 (kgr 7) ?
SQL: SELECT "type" FROM "reactor_summary" WHERE "unit"='greifswald - 7 (kgr 7)';

Question: Which unite had the type wwer-440/213?
SQL: SELECT "unit" FROM "reactor_summary" WHERE "type"='wwer-440/213';

Question: What was the date that construction was finished when the unit was greifswald - 4 (kgr 4)?
SQL: SELECT "finish_construction" FROM "reactor_summary" WHERE "unit"='greifswald - 4 (kgr 4)';

Question: What was the net power, when the type was wwer-440/230, and when construction was finished on 24.10.1977?
SQL: SELECT "net_power" FROM "reactor_summary" WHERE "type"='wwer-440/230' AND "finish_construction"='24.10.1977';