The previous page is sending you to https://www.thriftbooks.com/w/postgresql-10-vol1-the-sql-language-volume-1/18587184/item/25656947/?isbn=9888407228&idiq=25656947&srsltid=AfmBOorFU-PoN2Ah3P_JpzU67L17WIyUPEHgDggoM1qwWMfJDGE8ouVO1E4.

 If you do not want to visit that page, you can return to the previous page.