CREATE TABLE web.material_code
(
material_id integer NOT NULL,
code_id integer NOT NULL,
CONSTRAINT "PK_material_code" PRIMARY KEY (material_id, code_id),
CONSTRAINT material_code_code_id_fkey FOREIGN KEY (code_id)
REFERENCES web.code (code_id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION,
CONSTRAINT material_code_material_id_fkey FOREIGN KEY (material_id)
REFERENCES web.material (material_id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)It's my first time dealing with postgre, my other projects all run on mysql and there were no such problems.
Can you help me?

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