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我正在尝试在 Postgres 数据库中创建两个用户 - 一个具有对两个模式中所有表的读写访问权限，另一个具有对相同模式的读写创建（即，能够进行 DDL 更改）。

我目前有这些陈述。

CREATE SCHEMA
    schema_a;

CREATE SCHEMA
    schema_b;

CREATE ROLE read;
CREATE ROLE read_write;
CREATE ROLE read_write_create;

GRANT USAGE ON SCHEMA schema_a, schema_b TO read;
GRANT SELECT ON ALL TABLES IN SCHEMA schema_a, schema_b TO read;

GRANT INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA schema_a, schema_b TO read_write;
GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA schema_a, schema_b TO read_write;

GRANT ALL ON SCHEMA schema_a, schema_b TO read_write_create;

GRANT read to read_write;
GRANT …