CREATE TABLE "series" (
  "model" text,
  "processors_supported" text,
  "fsb_ht_frequency_m_hz" text,
  "memory" text,
  "pci_express" text,
  "sata" text,
  "pata" text,
  "sound" text
);

Question: Which processors are supported with a PCI-express of x16: 1 slot x1: 4 slots and the nforce 550 model?
SQL: SELECT "processors_supported" FROM "series" WHERE "pci_express"='x16: 1 slot x1: 4 slots' AND "model"='nforce 550';

Question: What are the processors supported by a ddr2 memory and the nforce 550 model?
SQL: SELECT "processors_supported" FROM "series" WHERE "memory"='ddr2' AND "model"='nforce 550';

Question: What is the PCI-express with a ddr2 memory and a nforce 520 model?
SQL: SELECT "pci_express" FROM "series" WHERE "memory"='ddr2' AND "model"='nforce 520';