Update syntax sqlite

The "target" table is the specific table that is being updated. The statement would look like this:. The subquery in the FROM clause computes the amount by which the inventory should be reduced for each itemId. That subquery is joined against the inventory table and the quantity of each affected inventory row is reduced by the appropriate amount.

The target table is not included in the FROM clause, unless the intent is to do a self-join against the target table. In the event of a self-join, the table in the FROM clause must be aliased to a different name than the target table. If the join between the target table and the FROM clause results in multiple output rows for the same target table row, then only one of those output rows is used for updating the target table.

The output row selected is arbitrary and might change from one release of SQLite to the next, or from one run to the next. In other words, the target table is named twice in the statement. With SQL Server, the inventory adjustment statement demonstrated above would be written like this:. The equivalent MySQL statement would be like this:. Any of the tables that participate in the join can be modified in the SET clause.

The SQLite UPDATE statement requires a table name followed by a list of column names or value pairs that should be assigned and the rows updation determined by a conditional expression that is tested against each row of the table. We will see how to use the SQLite UPDATE statement to update table rows with an example for that first create a table called products and insert some data by using the following queries.

After update check products tables records whether those are updated or not by using the following query. Once we execute the above query our products table records will be like as shown below.

It will update the row value whose product id equal to Now run and check products table records.