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    Updating Apache Iceberg Tables

    The UPDATE command updates rows in a table.

    UPDATE <table_path>.<table_name> [AS alias]
    SET <column1_name> = <value1> [, <column2_name> = <value2> ... ]
    [ FROM <additional_table_or_query> [, <additional_table_or_query> ]
    [ WHERE where_conditions ]




    The name of the table with data that you want to update.

    SET <column1_name> = <value1> [, <column2_name> = <value2> ... ]


    Sets the value of one or more columns. The value can be any expression or sub-query that returns a single value.




    If you need to refer to additional tables or subqueries in the WHERE clause to help identify the rows to be updated or for setting new values, then specify those table names in the USING clause. Enclose subqueries in parentheses.

    When a WHERE clause contains a JOIN between source tables in the USING clause and the target table, a row in the target table might join with more than one row in the source table. When this condition occurs, the UPDATE command fails with an error message.

    WHERE where_conditions



    The filter for specifying which rows of the table to update.

    Example UPDATE command using FROM and WHERE
    UPDATE target 
    SET v = b.v + c.v
    FROM src b , (select k, min(v) v from src_new group by k having min(v) > 10) c
    WHERE target.k = b.k and target.k = c.k;

    For Dremio v22 and earlier:

    Join conditions are not supported in WHERE clauses. If you need to use a join condition, use a MERGE statement.

    Example of an unsupported UPDATE command
    update t2 set id = id + t1.id from t1 where t1.name = t2.name;
    Equivalent MERGE command
    merge into t2 using t1 on (t1.name = t2.name) when matched then update set id = t2.id + t1.id;