How do I check for a column update in SQL?

How do you update a column in a SQL function?

T-SQL Update table columns using function

  1. Create a LOOP.
  2. Get a row, select its Name value.
  3. Execute the function using the selected name, and store its result in temp variables.
  4. Insert the temp variables in the table.
  5. Move to the next record.

How do you check if a row has been updated in SQL?

the values in the update statement and either apply the update or not. You could use the Columns_Updated() function in the trigger to see if anything had been updated, and proceed accordingly.

How do you automatically update a column in SQL?

To enable Auto Update Statistics, open SQL Server Management Studio, then in object explorer expand SQL Server instance and right-click the database which you want to enable Auto Update Statistics on.

Which SQL keyword is used to retrieve a maximum value?

MAX() is the SQL keyword is used to retrieve the maximum value in the selected column.

Can we UPDATE multiple rows in a single SQL statement?

Column values on multiple rows can be updated in a single UPDATE statement if the condition specified in WHERE clause matches multiple rows. In this case, the SET clause will be applied to all the matched rows.

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How do I check if a column is updated in a trigger?

There are three ways one can check if a column was updated inside a trigger:

  1. Check for the value of UPDATE(Column_Name)
  2. Check for the value of COLUMNS_UPDATED() & integer mask for the column updated (also works for more than one column)

When was a table last updated SQL Server?

If a user wants to find out when was the last table updated he can query dynamic management view (DMV) – sys. dm_db_index_usage_stats and easily figure out when was the table updated last.

What triggers SQL?

A SQL trigger is a database object which fires when an event occurs in a database. We can execute a SQL query that will “do something” in a database when a change occurs on a database table such as a record is inserted or updated or deleted. For example, a trigger can be set on a record insert in a database table.

Can we change column name in SQL?

It is not possible to rename a column using the ALTER TABLE statement in SQL Server. Use sp_rename instead. To rename a column in SparkSQL or Hive SQL, we would use the ALTER TABLE Change Column command.

How use triggers in SQL?

create trigger [trigger_name]: Creates or replaces an existing trigger with the trigger_name. [before | after]: This specifies when the trigger will be executed. {insert | update | delete}: This specifies the DML operation. on [table_name]: This specifies the name of the table associated with the trigger.

Which is an SQL * Plus command?

SQL*Plus is a command-line tool that provides access to the Oracle RDBMS. SQL*Plus enables you to: Enter SQL*Plus commands to configure the SQL*Plus environment. Startup and shutdown an Oracle database.

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Which SQL keyword is used to retrieve unique values?

The correct answer is option D (Select distinct).

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