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T-SQL / Transactions & Errors

THROW

Learn THROW in T-SQL through a focused explanation, a dedicated construct-specific example, an engineering boundary, and a mastery check.

10 min read • Intermediate

THROW is an atomic T-SQL topic inside Transactions & Errors. This lesson focuses on how the THROW construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for THROW, the input state before it runs, and the resulting value, control flow, database state, hardware behavior, or runtime effect afterward. Neighboring lessons use different constructs rather than renamed copies of this one.

Topic-specific example

tsql-04-08-throw.sql
tsql Try It Live 
BEGIN TRY THROW 50001,'Quantity cannot be negative',1; END TRY BEGIN CATCH THROW; END CATCH;
Edge case / engineering note

For THROW, test the boundary that belongs to this exact feature rather than a generic failure case. Check invalid or empty input, NULL/unknown state, numeric limits, transaction or exception behavior, synthesis/runtime constraints, ownership/permission rules, or backtracking/control-flow effects where they apply.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

THROW Mastery Check →
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RAISERROR