Updating multiple rows at a time in sql
Update a table from another table Update query Update rows in one table based on minimum date value from another table Optimize Update Query not valid?Trying to update a salary based on the bank the person works for Update Trigger Always fires?
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But, what you can do is pass in all the values you want to update as a table valued parameter. FROM statement that will enable you to update all the values based on the listing of values within the parameter.
If I have understood your question correctly, you are trying to update employee_Name for various EIDs with a single select statement.
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This is in fact entirely possible in many database systems.
In the case of Postgre SQL, it can be done using a FROM clause with UPDATE, like this: This does an INNER JOIN between the tables “staff” and “updates” where the column “name” matches.But we can group the updates according to the value being set, and then do one UPDATE statement per distinct value.In this case there are two distinct values, so we can do it in two UPDATE statements: So we can reduce the number of queries from five to two. But the extent to which this helps us reduces as the proportion of distinct SET values goes up.SQL Server FAQ SQL Server FAQ - Updating Multiple Rows with One UPDATE Statement By: (Continued from previous topic...) How To Update Multiple Rows with One UPDATE Statement?If the WHERE clause in an UPDATE statement matches multiple rows, the SET clause will be applied to all matched rows.Eventually every SET value is different, for example: UPDATE staff SET salary = 1125 WHERE name = ' Bob'; UPDATE staff SET salary = 1200 WHERE name = ' Jane'; UPDATE staff SET salary = 1100 WHERE name = ' Frank'; UPDATE staff SET salary = 1175 WHERE name = ' Susan'; UPDATE staff SET salary = 1150 WHERE name = ' John'; Since every SET clause is now different, we can’t coalesce any queries using the approaches mentioned before, so we still have one UPDATE statement for every row requiring changes. What if we had a database table which contained a representation of the updates we wanted to make, e.g.