Columns in a row are accessed in a sequential manner in the order of their creation. For example, to access columns at the end of a row, SQL Anywhere has to skip over any columns that appear earlier in the row. Primary key columns are always stored at the beginning of rows. For this reason, it is important to create tables so that small and/or frequently accessed columns are placed before seldom accessed columns in the table.

See also

• Database design concepts
• Managing primary keys