Table: porphyria_data
Columns: enzyme
location
substrate
product
chromosome
ec
omim
porphyria

Question: what is the subtrate for enzyme ala dehydratase
SQL: SELECT "substrate" FROM porphyria_data WHERE "enzyme" = 'ALA dehydratase'

Question: how many porphyria have substrate δ-aminolevulinic acid
SQL: SELECT COUNT("porphyria") FROM porphyria_data WHERE "substrate" = 'δ-Aminolevulinic acid'

Question: give the location of subtrate coproporphyrinogen iii
SQL: SELECT "location" FROM porphyria_data WHERE "substrate" = 'Coproporphyrinogen III'