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For detailed information on the use of column DEFAULT values, see “Using column defaults” in Chapter 9, “Ensuring Data Integrity” in the System Administration Guide: Volume 1.
See CREATE TABLE statement for details about updating IDENTITY/AUTOINCREMENT columns, which are another type of DEFAULT column.
Further, if a single-column primary key already contains an entry Value, an INSERT of value is rejected, as it would make the primary key not unique.
The FROM clause can contain multiple tables with join conditions and returns all the columns from all the tables specified and filtered by the join condition and/or WHERE condition.If no WHERE clause is specified, every row is updated.If you specify a WHERE clause, Sybase IQ updates only rows satisfying the search condition.Using the wrong join condition in a FROM clause causes unpredictable results.If the FROM clause specifies a one-to-many join and the SET clause references a cell from the “many” side of the join, the cell is updated from the first value selected.