UPDATE Example: The UPDATE statement is normally used with the WHERE clause in order to specify which rows are to have their columns changed.
However, the easiest and the most clean way is to use JOIN clause in the UPDATE statement and use multiple tables in the UPDATE statement and do the task.
As you can see that using JOIN clause in UPDATE statement it makes it very easy to update data in one table from another table. Col2 AS _Col2 FROM T1 JOIN T2 ON T1= T2/*Where clause added to exclude rows that are the same in both tables Handles NULL values correctly*/ WHERE EXISTS(SELECT T1.
YOu coud chask on your phpmyadmins ar here piliapp.com/mysql-syntax-check/Nice explanation and i found some error message as Multipart identifier table1.column1 when i executed sample query using your example.
Col1 IN (21, 31) GOMy Query which executed:: UPDATE t1 SET t1.
Cross table update (also known as correlated update, or multiple table update) in Oracle uses non-standard SQL syntax format (non ANSI standard) to update rows in another table. Update data in table A based on two or more common columns in table B.
The differences in syntax are quite dramatic compared to other database systems like MS SQL Server or My SQL. Updates based on two or more common columns are normally used for tables where multiple columns work together as a primary key (known as composite primary key).
Note the use of the alias CAT for the CATEGORY table in the FROM clause.
The previous example showed an inner join specified in the FROM clause of an UPDATE statement.
When asked the reason was he had no idea how to use multiple tables with the help of the JOIN clause in the UPDATE statement. Additionally, we want to update the values of Col2 and Col3 only.