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  1. stackoverflow.com › questions › 15510456c# - Updating a field in a MySQL table if it's empty - Stack...

    19 mar 2013 · REPLACE INTO will stomp any data already present and is equivalent to a DELETE followed by an INSERT statement. What you might want is: INSERT IGNORE INTO users (uid, username, screenname, ...) VALUES (@...) ON DUPLICATE KEY UPDATE uid=VALUES(uid), username=VALUES(username), ...

  2. dba.stackexchange.com › questions › 36747IF NOT NULL then UPDATE else keep the value of the field

    I tried to find some solution and something like the following query seems to be the solution but I can't get it to work: UPDATE DeviceAttribute. SET Details = CASE Name. WHEN 'Accessories' IS NOT NULL THEN @Accessories. WHEN 'Description' IS NOT NULL THEN @Description.

  3. www.w3schools.com › mysql › mysql_null_valuesMySQL NULL Values - IS NULL and IS NOT NULL - W3Schools

    The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field: Example Get your own SQL Server. SELECT CustomerName, ContactName, Address. FROM Customers. WHERE Address IS NULL; Try it Yourself » Tip: Always use IS NULL to look for NULL values.

  4. www.geeksforgeeks.org › how-to-update-null-values-in-a-field-in-mysqlHow to Update NULL Values in a Field in MySQL - GeeksforGeeks

    17 maj 2024 · Updating a column with a NULL value in MySQL is surprisingly straightforward. Check out this basic syntax: UPDATE table_name. SET column_name= 'N/A' WHERE condition; table_name: The name of your table. column_name: The column you want to turn into NULL. condition: When you want to be selective. If you skip this, it'll update all rows.

  5. www.geeksforgeeks.org › how-to-check-a-column-is-empty-or-null-in-mysqlHow to Check a Column is Empty or Null in MySQL?

    2 lut 2024 · To determine if a column is empty or null in MySQL, we utilize the IS NULL and IS NOT NULL conditions in a SELECT statement. To ascertain if a column is empty or null in SQL, use COALESCE(column, '') or column IS NULL OR column = '' .

  6. www.c-sharpcorner.com › insert-update-delete-display-data-in-mysql-using-C-SharpInsert, Update, Delete, Display Data in MySQL Using C# - C#...

    12 maj 2022 · MySqlConnection MyConn2 = new MySqlConnection(MyConnection2); MySqlCommand MyCommand2 = new MySqlCommand(Query, MyConn2); MySqlDataReader MyReader2; MyConn2.Open(); MyReader2 = MyCommand2.ExecuteReader(); MessageBox.Show("Data Updated"); while (MyReader2.Read()) { } MyConn2.Close();//Connection closed here } catch (Exception ex) { MessageBox ...

  7. dba.stackexchange.com › update-a-column-if-the-update-querys-value-is-not-emptymysql - Update a column if the update query's value is not empty...

    4 sie 2021 · If this value is not NULL but some predefined literal (for example, empty string '') then use SET column = COALESCE(NULLIF(?, ''), column). Additional NULLIF converts this predefined value to NULL (and not changed any other value) then the expression acts like described above.

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