CREATE TABLE table_182499_1 (porphyria VARCHAR, substrate VARCHAR)

how many porphyria have substrate -aminolevulinic acid
SELECT COUNT(porphyria) FROM table_182499_1 WHERE substrate = "δ-Aminolevulinic acid"
SELECT COUNT("porphyria") FROM "table_182499_1" WHERE "substrate" = "δ-Aminolevulinic acid"