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1 cze 2015 · If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row is performed. Please read URL for more details.
5 gru 2019 · if exists (select 'x' from foo where bar) /* found, do something */. else. /* not found, do something else */. In PL/SQL, since I can't put an EXISTS() in an IF statenment, the nearest I can manage is something like this... declare. c integer; begin.
19 lip 2022 · update customers_dim cd set ( full_name, update_datetime ) = ( select cs.full_name, systimestamp from customers_stage : cs where cs.customer_id = cd.customer_id ) where : exists ( select null from customers_stage ce where : ce.customer_id = cd.customer_id ) Plan hash value: 3378486070
29 kwi 2015 · IF EXISTS (select * from users where username = 'something') THEN. update users set id= 'some' where username = 'something'; ELSE. insert into users (username) values ('something'); END IF; end $$. delimiter ; and call it like this: call select_or_insert();
13 lut 2012 · update mytemp set mytemp.x = decode(x,1,5,2,6,null,7,x), .... where (x = 1 or x=2 or x is null) OR (y = 1 or y=2 or y is null) OR (..... to only update rows that actually need to be updated.
17 lis 2010 · I want to add a row to a database table, but if a row exists with the same unique key I want to update the row. For example: INSERT INTO table_name (ID, NAME, AGE) VALUES(1, "A", 19); Let’s say the unique key is ID, and in my Database, there is a row with ID = 1.
UPDATE is a DML statement that modifies rows in a table. An UPDATE statement can start with a WITH clause to define common table expressions accessible within the UPDATE. See Section 13.2.15, “WITH (Common Table Expressions)”. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference . SET assignment_list . [WHERE where_condition]
