sql - How to cancat query results into a text variable? -


i know built-in functions performs it. learn sql , want understand how make without these functions. i.e. have next code:

declare @stmt varchar; select column_1 @stmt some_table;

how can change code stores values in @stmt single string 'value 1, value2, value 3, ..., value n'?

if want concat different values of column_1, use this

select string_agg(column_1,',') @stmt some_table;

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