Αποτελέσματα Αναζήτησης
12 Δεκ 2011 · To update two fields you may use an example like this: UPDATE table1 t1 SET (col1, col2) = ( SELECT col3, col4 FROM table2 t2 WHERE t1.col8=t2.col9 ) The optimizer will see that the sub-queries in the SET and the FROM clause are identical and it should merge them in the internal execution plan.
To update data in a table or view, use the UPDATE statement. With the UPDATE statement, you can change the value of one or more columns in each row that meets the search condition of the WHERE clause.
In this syntax: First, specify the name of the table that you want to update data. Second, specify a list of column c1, c2, …, cn and the corresponding value v1, v2, … vn that need to be updated. Third, specify the condition to indicate which rows to be updated.
Updating Db2 data by using UPDATE statements. You can change the data in a table by using the UPDATE statement or the MERGE statement. The UPDATE statement modifies zero or more rows of a table, depending on how many rows satisfy the search condition that you specify in the WHERE clause.
DB2 and Oracle provide the UPDATE statement to update existing rows in a table, but there are differences in the syntax. Assume there is a sample table: CREATE TABLE colors. ( . name VARCHAR(30), . hex CHAR(7), . rgb CHAR(11) ); . INSERT INTO colors VALUES ('Red', NULL, NULL); List Assignment in DB2.
UPDATE statement. The UPDATE statement updates the values of specified columns in rows of a table, view or nickname, or the underlying tables, nicknames, or views of the specified fullselect. Updating a row of a view updates a row of its base table, if no INSTEAD OF trigger is defined for the update operation on this view.
26 Απρ 2018 · update TableA A set email = (select email from TableB B where A.address_id = B.address_id) where exists (select 1 from TableB B where A.address_id = B.address_id) ; Another option is to use MERGE : MERGE INTO TableA AS A USING ( SELECT address_id, email FROM TableB ) AS B ON A.address_id = B.address_id WHEN MATCHED THEN UPDATE SET email = B.email ;
