On Duplicate Key Update - Multiple Columns

Question

When using insert... on duplicate key update, what is the syntax to update multiple columns?

INSERT INTO table1 (col1, col2, col3, col4) VALUES (’$val1’, ‘$v         


        

Answer 1

INSERT INTO table1
  (`col1`, `col2`, `col3`, `col4`)
VALUES
  ('val1', 'val2', 'val3', 'val4')
ON DUPLICATE KEY UPDATE
  `col2`='val2',
  `col3`='val3', [...]

I fixed your quotes and tickmarks.

Edit:

In PHP:

$result = mysql_query("
     INSERT INTO table1
         (col1, col2, col3, col4)
     VALUES
         ('" . $val1 . "',  '" . $val2 . "', '" . $val3 . "', '" . $val4 . "')
     ON DUPLICATE KEY UPDATE
         col2='" . $val2 . "',
         col3='" . $val3 . "',
         col4='" . $val4 . "'"
 );

Note that the values are surrounded by single quotation marks '. If the values are a number type (INT, FLOAT, etc) you can drop those quotation marks. Backticks are optional around the column names as long as you are not using column names like count, type, or table.

In the PHP example, string concatenation is used to clearly separate out the variables.