19 lines
558 B
SQL
19 lines
558 B
SQL
-- 004_balance_constraints.sql
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-- Enforce balance integrity constraints
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-- WARNING: Apply after data cleanup if you have existing inconsistent data
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ALTER TABLE bank_accounts
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ADD CONSTRAINT bank_accounts_reserved_nonnegative
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CHECK (reserved_balance >= 0);
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ALTER TABLE bank_accounts
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ADD CONSTRAINT bank_accounts_available_nonnegative
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CHECK (available_balance >= 0);
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ALTER TABLE bank_accounts
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ADD CONSTRAINT bank_accounts_balance_consistency
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CHECK (
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available_balance <= balance
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AND (available_balance + reserved_balance) <= balance
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);
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