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A comment on PostgreSQL anti-patterns: read-modify-write cycles (2014). Parent comment
Query 1 (in CTE): Verify all is correct and the current balance (and whether you have enough balance)
Query 2: Perform update and obtain new balance
Then return a summary showing the starting balance and end balance for the transaction (proof of what, if anything, happened).
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Query 1 (in CTE): Verify all is correct and the current balance (and whether you have enough balance)
Query 2: Perform update and obtain new balance
Then return a summary showing the starting balance and end balance for the transaction (proof of what, if anything, happened).