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Update many rows into one table from another table based on one column in each being equal (user_id).
both tables have a user_id column. Need to insert data from t2 into t1 when the user_id column are equal.
Thank you in advance for any help offered.
832
UPDATE table SET col = new_value WHERE col = old_value AND other_col = some_other_value; UPDATE table SET col = new_value WHERE col = old_value OR other_col = some_other_value; As you can see, you can expand the WHERE clause as much as you'd like in order to filter down the rows for updating to what you need.
In such a case, you can use the following UPDATE statement syntax to update column from one table, based on value of another table. UPDATE first_table, second_table SET first_table. column1 = second_table. column2 WHERE first_table.id = second_table.
Update with conditionWHERE clause can be used with SQL UPDATE to add conditions while modifying records. Without using any WHERE clause, the SQL UPDATE command can change all the records for the specific columns of the table.
SQL Server UPDATE JOIN syntaxFirst, specify the name of the table (t1) that you want to update in the UPDATE clause. Next, specify the new value for each column of the updated table. Then, again specify the table from which you want to update in the FROM clause.
update table1 t1 set ( t1.column1, t1.column2 ) = ( select t2.column1, t2.column2 from table2 t2 where t2.column1 = t1.column1 ) where exists ( select null from table2 t2 where t2.column1 = t1.column1 ); Or this (if t2.column1 <=> t1.column1 are many to one and anyone of them is good):
update table1 t1 set ( t1.column1, t1.column2 ) = ( select t2.column1, t2.column2 from table2 t2 where t2.column1 = t1.column1 and rownum = 1 ) where exists ( select null from table2 t2 where t2.column1 = t1.column1 ); If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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