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Query Basics
TOP TOP WITH TIES OFFSET FETCH IIF CHOOSE CONCAT STRING_AGG STRING_SPLIT TRY_CAST TRY_CONVERT
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DECLARE variable SET variable SELECT assignment IF ELSE WHILE BREAK CONTINUE BEGIN END GOTO label RETURN code
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ROW_NUMBER RANK DENSE_RANK NTILE LAG LEAD FIRST_VALUE LAST_VALUE PERCENT_RANK Running aggregate
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T-SQL / Query Basics

STRING_AGG

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

10 min read • Beginner

STRING_AGG is an atomic T-SQL topic inside Query Basics. This lesson focuses on how the STRING_AGG construct is written, what it changes, and when it is the right tool.

Trace the example line by line. Identify the exact syntax for STRING_AGG, 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-01-07-string-agg.sql
tsql Try It Live 
SELECT team_id,STRING_AGG(name,', ') AS members FROM Players GROUP BY team_id;
Edge case / engineering note

For STRING_AGG, 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

STRING_AGG Mastery Check →
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