How can I update multiple tables in My SQL with a single query? The WHERE clause is evaluated separately for each table. Some lessons are learned the hard way, this one was learned in the terrifing way. That's usually what stored procedures are for: to implement several SQL statements in a sequence.
There’s probably an article from 20 years covering this.I need to update results column in table one using data from table two. Table two and three and table one and three are related as you can see above. I need the results value to be 355 in table one and this data is coming from table 2, but these two are unrelated, and they can be related using table three. Should any right be infringed, it is totally unintentional.Drop me an email and I will promptly and gladly rectify it.First table ("names") Well, there is an immediate advantage in performing just a single SQL query instead of two, and I believe it is quite clear: the server will have a lighter work load.
At the same time, we will have a full control on the performed operation, which will be faster and easier to maintain.
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).
Summary answer from that question: You can't update multiple tables in one statement, however, you can use a transaction to make sure that two UPDATE statements are treated atomically.
WAprrs = 'start,stop' FROM Table1 T1, Table2 T2 WHERE T1= T2and T1= '011008'; COMMIT; @unknown: Based on your comment, you would need to join across both Table1 and Table2 when you update Table2 if your update query needs the keys from a third table.
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