transpose

I have the following table, which gives multiple email addresses for each user. I need to flatten this out to columns on a user query. To give me the "newest" 3 email addresses based on the creation date. user.name | user.id | email1 | email2 | email3** Mary | 123 | mary@gmail.com | mary@yahoo.co.uk | mary@test.com Joe | 345 | joe@gmail.com | [NULL] | [NULL] Erwin Brandstetter Use crosstab() from the tablefunc module. SELECT * FROM crosstab( $$SELECT user_id, user_name, rn, email_address FROM ( SELECT u.user_id, u.user_name, e.email_address , row_number() OVER (PARTITION BY u.user_id ORDER BY

Are there formulas to convert data in a column to a matrix or to a row? And to convert from/to other combinations? What about an even more complex case: reshape a matrix of width W to width N*W? There are a few similar or related questions. I have answered some of them, marked with *. I keep updating this list, as new similar (or equal) questions are added: Formatting Data: Columns to Rows * Move content from 1 column to 3 columns * how to split one column into two columns base on conditions in EXCEL * writing a macro to transpose 3 columns into 1 row Excel VBA transpose with characters