Monday, November 5, 2007

SQL UPDATE

Once there's data in the table, we might find that there is a need to modify the data. To do so, we can use the UPDATE command. The syntax for this is

UPDATE "table_name"
SET "column_1" = [new value]
WHERE {condition}

For example, say we currently have a table as below:

Table Store_Information

store_name Sales Date
Los Angeles $1500 Jan-05-1999
San Diego $250 Jan-07-1999
Los Angeles $300 Jan-08-1999
Boston $700 Jan-08-1999

and we notice that the sales for Los Angeles on 01/08/1999 is actually $500 instead of $300, and that particular entry needs to be updated. To do so, we use the following SQL:

UPDATE Store_Information
SET Sales = 500
WHERE store_name = "Los Angeles"
AND Date = "Jan-08-1999"

The resulting table would look like

Table Store_Information

store_name Sales Date
Los Angeles $1500 Jan-05-1999
San Diego $250 Jan-07-1999
Los Angeles $500 Jan-08-1999
Boston $700 Jan-08-1999

In this case, there is only one row that satisfies the condition in the WHERE clause. If there are multiple rows that satisfy the condition, all of them will be modified.

It is also possible to UPDATE multiple columns at the same time. The syntax in this case would look like the following:

UPDATE "table_name"
SET column_1 = [value1], column_2 = [value2]
WHERE {condition}

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