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Sql trigger for updating one table from another

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A constraint can apply either to new data only (like a trigger) or to both new and existing data.

It appears that in your example, the connecting column is the Employee No column.

SQL statements running in triggers follow the same rules that standalone SQL statements do.

Specifically: How Triggers and Constraints Differ Both triggers and constraints can constrain data input, but they differ significantly. For example, a trigger can prevent a DML statement from inserting a values that were inserted into the column before the trigger was defined or while the trigger was disabled.

The modified column cannot be any one of the following: Some data type changes may cause a change in the data.

For example, changing an nchar or nvarchar column to char or varchar may cause the conversion of extended characters.