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The UPSERT operation either updates or inserts a row in a table, depending if the table already has a row that matches the data: if table t has a row exists that has key X: update t set mystuff... where mykey=X else insert into t mystuff...
Some views are updatable and references to them can be used to specify tables to be updated in data change statements. That is, you can use them in statements such as UPDATE, DELETE, or INSERT to update the contents of the underlying table.
TABLE in MySQL 8.0.19 and later to insert rows from a single table. INSERT with an ON DUPLICATE KEY UPDATE clause enables existing rows to be updated if a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY .
19 lip 2022 · Statement 1. create sequence customer_merge_id. Sequence created. Statement 2. Target table to load. create table customers_dim ( . customer_id integer not null primary key, . full_name varchar2(100) . not null, . birth_date date not null, . insert_datetime timestamp default systimestamp not null, .
17 paź 2024 · The MERGE statement in SQL can insert a new record into a table or update the existing record if it already exists. It is supported by databases like Oracle, SQL Server, and PostgreSQL. Let’s look at how we can use the MERGE statement: MERGE INTO Department AS target.
14 kwi 2019 · MySQL is just returning: Can't update table 'city' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. Is there any way I can make this work? Thanks everyone! mysql. query. Share. Improve this question. asked Apr 14, 2019 at 22:45.
This statement compares the contents of the people_target and people_source tables by using the person_id column and conditionally inserts and updates data in the people_target table. For each matching row in the people_source table, the values in the people_target table are set to those from the people_source table.
