set column mysql code example
Example 1: mysql update add to existing value
mysql> UPDATE tableName SET sometotal = sometotal+10 WHERE Id = 4;
Example 2: php mysql update all rows in table new values
$idresult = $conn->query("SELECT id FROM pictures");
while ($row = $idresult->fetch_assoc()){
mysqli_query($conn, "UPDATE pictures SET UniqueKey = '$UniqueKey' WHERE id = " . $row['id'];
}
Example 3: change column in mysql
#Alter is used
#alter table TableName change CurrentColumnName NewColumnName Specification(size);
alter table TableName change name firstname varchar(30);