Web Reference: Feb 25, 2026 · Explore the select top SQL clause and discover why it can speed up queries or slow down based on various factors. The *shorthand can be slower because: 1. Not all the fields are indexed, forcing a full table scan - less efficient 2. What you save to send SELECT *over the wire risks a full table scan 3. Returning more data than is needed 4. Returning trailing columns using variable length data type can result in search overhead Apr 4, 2024 · From a performance perspective, using SELECT * in applications can cause performance problems in queries, mainly manifesting in the following six aspects: Increased parsing cost: SELECT * requires the database to parse more objects, permissions, attributes and other related content.
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