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Detailed explanation of the usage of Database update

Update is a database SQL syntax used to update existing data in a table and to use where matching fields when used alone.

The syntax is: UPDATE table name SET column name dao name = new value WHERE column name = some value

For example: Update table_name Set column_name = new_value Where column_name = some_value

Extended data

Considerations for using update:

1. Sp_updatestats can update the statistical information to the latest.

2. Low memory will cause query plans that have not been connected by the client to be cleared.

3. Modify the table structure. After modifying the index, the query plan will be cleared, and the query can be run several times after modification.

4. When using update, order by will affect the query speed, while the function in where will call the filter to scan the table, so try to avoid scanning the table.

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