Quick Answer: How do you add duplicates in SQL?

How do I sum duplicates in SQL?

You can specify either ALL or DISTINCT modifier in the SUM() function.

  1. The DISTINCT modifier instructs the SUM() function to calculate the total of distinct values, which means the duplicates are eliminated.
  2. The ALL modifier allows the SUM() function to return the sum of all values including duplicates.

How do I insert duplicate rows in SQL?

If you’re able to use MySQL Workbench, you can do this by right-clicking the row and selecting ‘Copy row’, and then right-clicking the empty row and selecting ‘Paste row’, and then changing the ID, and then clicking ‘Apply’.

How do you create a duplicate key in SQL?

The Insert on Duplicate Key Update statement is the extension of the INSERT statement in MySQL. When we specify the ON DUPLICATE KEY UPDATE clause in a SQL statement and a row would cause duplicate error value in a UNIQUE or PRIMARY KEY index column, then updation of the existing row occurs.

Can we use Max and sum together in SQL?

SUM() and MAX() at the same time

I have to group a number of specific tuples together to get the sum and then retrieve the maximum of that sum. … So to answer your question, just go ahead and use SUM() and MAX() in the same query.

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How do you sum a condition in SQL?

SELECT SUM(column_name) FROM table_name WHERE condition;

  1. SQL SUM() function example – On a Specific column. …
  2. SUM() function On multiple columns. …
  3. SQL SUM() with where clause. …
  4. SQL SUM() EXAMPLE with DISTINCT. …
  5. SQL SUM function with GROUP BY clause.

Why am I getting duplicate rows in SQL?

You are getting duplicates because more than one row matches your conditions. To prevent duplicates use the DISTINCT keyword: SELECT DISTINCT respid, cq4_1, dma etc…

How do I duplicate a row?

Select the rows into which you want to copy the original row or rows. Right-click the selection, and then click “Insert Copied Cells.” Excel inserts the repeated data into the new rows, moving the existing rows down.

What causes duplicate rows in SQL?

If you do not include DISTINCT in a SELECT clause, you might find duplicate rows in your result, because SQL returns the JOB column’s value for each row that satisfies the search condition. Null values are treated as duplicate rows for DISTINCT.

How does on duplicate key work?

If you specify an ON DUPLICATE KEY UPDATE clause and a row to be inserted would cause a duplicate value in a UNIQUE index or PRIMARY KEY , an UPDATE of the old row occurs. If a=1 OR b=2 matches several rows, only one row is updated. …

Is duplicate data allowed in set?

A Set is a Collection that cannot contain duplicate elements. It models the mathematical set abstraction. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited. … Two Set instances are equal if they contain the same elements.

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How does on duplicate key update work?

ON DUPLICATE KEY UPDATE is a MariaDB/MySQL extension to the INSERT statement that, if it finds a duplicate unique or primary key, will instead perform an UPDATE. The row/s affected value is reported as 1 if a row is inserted, and 2 if a row is updated, unless the API’s CLIENT_FOUND_ROWS flag is set.