Decimal precision in SQL Server controls arithmetic results and rounding; use explicit scales, test boundaries, and compare money with decimal.
Hashing Data With HASHBYTES
HASHBYTES creates repeatable row fingerprints with SHA2 algorithms, but input encoding, NULL handling, and collision risk need a clear plan.
SQL Server Permissions Without the Guesswork
Understand SQL Server permissions through principals, securables, roles, and ownership chains, then inspect what the current account can do.
Handling Time Zones in SQL Server
Handling time zones in SQL Server means storing an instant, converting with AT TIME ZONE, and testing daylight saving gaps.
Keyset Pagination: Next and Previous Pages Without OFFSET
Build keyset pagination with a matching index, unique tie breaker, next and previous queries, and a fair deep-page comparison with OFFSET.
ASCII Versus UNICODE: Inspect the First Character
ASCII versus UNICODE asks different representation questions. Compare a first UTF-8 byte with a code point while preserving the complete input.
Explaining a Query Plan to a Developer
Explaining a query plan starts with the costly work, checks estimates against actual rows, and turns findings into a clear code decision.