Duplicate records clutter databases and render the data within them unclear.I want to run an update so that every row in Column A gets updated with 'RANDOM STRING' if Column A is LIKE Column B. However the string in Column B could occur anywhere in the String in Column A.Can I make a function that update in the same time all the column that meets this condition?I can solve in mini solution with query but I can't join all this mini query to solve my [email protected], this actually makes sense, why is this downvoted?I had a situation where I need to copy a date value from one column to other columns, and it only applies to SOME of the columns, and not all.Also, if the table you're updating is the same as the table in the FROM clause and the FROM clause contains only one reference to the table, an alias might not be specified.If the table you're updating appears more than once in the FROM clause, only one reference to the table can omit a table alias; all other references to the table must include a table alias.
This prevents the UPDATE from trampling over rows where there is no match (usually nulling all the values).
So basically I want to set each NULL Question ID to be equal to the Question ID found in the Answers table on the Answer row of the Answer ID that is in the trackings table (same row as the NULL Question ID that is being written). Having a problem with a similar situation in Php My Admin over My SQL.
In my case, the source and destination columns are in the same table, but record selection is based on the other table.
However, you have no way of influencing what the last row will be, and on multiprocessor machines where the query might be parallelized, the last row might differ from execution to execution.
Therefore, we recommend that you avoid the 1: M relationship.