The SYSCOLUMN view is provided for compatibility with older versions of Sybase IQ that offered a SYSCOLUMN system table. However, the previous SYSCOLUMN table has been replaced by the ISYSTABCOL system table, and its corresponding SYSTABCOL system view, which you should use instead.
The SYSCOLUMN view is a SQL Anywhere compatibility view. See "SYSCOLUMN compatibility view (deprecated)" in SQL Anywhere Server – SQL Reference.