How do I merge 3 columns in SQL?

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The three columns can have a different value but they are all the same type. I need to do a join such that I merge all the items in the three .MySQL combine two columns into one column - Stack OverflowHow to combine multiple columns into one column? - Stack Overflowsql server - SQL - Combine data from several columns into one columnMerge on multiple columns - sql - Stack OverflowДругие результаты с сайта stackoverflow.com

How do I combine 3 columns in SQL?

1CONCAT. This function is used to concatenate multiple columns or strings into a single one. ... 2CONCAT_WS. The CONCAT_WS() function not only adds multiple string values and makes them a single string value. ... 3Using them in WHERE CLAUSE. You can use both of them in WHERE CLAUSE for selection based on condition. ... 4Conclusion.

Can I group by 3 columns in SQL?

The SQL GROUP BY clause is used along with some aggregate functions to group columns that have the same values in different rows. The group by multiple columns technique is used to retrieve grouped column values from one or more tables of the database by considering more than one column as grouping criteria.

Can you join on multiple columns in SQL?

If you'd like to get data stored in tables joined by a compound key that's a primary key in one table and a foreign key in another table, simply use a join condition on multiple columns. In one joined table (in our example, enrollment ), we have a primary key built from two columns ( student_id and course_code ).

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