Your UPDATE query should look like this: UPDATE table2 t2 SET val2 = t1.val1 FROM table1 t1 WHERE t2.table2_id = t1.table2_id AND t2.val2 IS DISTINCT FROM t1.val1; — optional, see below The way you had it, there was no link between individual rows of the two tables. Every row would be fetched from table1 for … Read more
Separate values with commas. AND is an logical operator, its place is in WHERE and ON clauses. UPDATE customers SET firstname=”John”, lastname=”Smith” WHERE id=1;
Without knowing your database it’s tough to be specific. In SQL Server the syntax would be something like … UPDATE MyTable SET Field1 = IsNull(@Field1, Field1), Field2 = IsNull(@Field2, Field2), Field3 = IsNull(@Field3, Field3) WHERE <your criteria here> EDIT Since you specified SQLLite …replace my IsNull function with COALESCE() or alternately look at the IfNull … Read more
all you should do is just join the tables like this. UPDATE table2 t2 JOIN table1 t1 ON t1.id = t2.id SET t2.name = t1.name; RESULTS WITH JOIN if you are set on doing it with a select you could do it like this. UPDATE table2 t2, ( SELECT Name, id FROM table1 ) t1 … Read more
Have you tried to use null for that field when updating? You could also try setting default value to CURRENT_TIMESTAMP, rather than 0000-00-00 00:00:00. Nevertheless, whenever I want to have creation and update time I always use the following: … CREATED timestamp NOT NULL default ‘0000-00-00 00:00:00’, UPDATED timestamp NOT NULL default now() on update … Read more
you can use ROWCOUNT SET ROWCOUNT 1 UPDATE table1 SET name2 = ’01’ WHERE name1=’xx’ SET ROWCOUNT 0 or you can use update top UPDATE TOP (1) table1 SET name2 = ’01’ WHERE name1=’xx’
In CRUD operations, the INSERT is the ‘C’ and the UPDATEis the ‘U’. They are two of the four basic functions of persistent storage. The other two are SELECT and DELETE. Without at least these four operations, a typical database system cannot be considered complete. Use INSERT to insert a new record. Use UPDATE to … Read more
Your way is correct, and here is another way you can do it: update Table1 set Description = t2.Description from Table1 t1 inner join Table2 t2 on t1.DescriptionID = t2.ID The nested select is the long way of just doing a join.
UPDATE YourTable SET columnName = null WHERE YourCondition