SQL update columns with arithmetical expression
In this page, we are going to discuss how to change the data of the columns with the SQL UPDATE statement using an arithmetical expression.
Example:
Sample table: neworder
To change the value of 'advance_amount' column with a new value as specified -
1. 'ord_amount'*10,
the following SQL statement can be used:
SQL Code:
UPDATE neworder
SET advance_amount=ord_amount*.10;
Output:

SQL update columns with arithmetical expression and where
In the following, we are going to discuss how to change the data of the columns with the SQL UPDATE statement using arithmetical expression and SQL WHERE clause.
Example:
Sample table: neworder
To update the value of 'advance_amount' with following conditions -
1. new value for 'advance_amount is 'ord_amount'*10,
2. 'ord_date' must be greater than '01-Aug-08',
the following SQL statement can be used:
SQL Code:
UPDATE neworder
SET advance_amount=ord_amount*.10
WHERE ord_date>'01-Aug-08';
SQL update columns with arithmetical expression and boolean 'AND'
In the following, we are going to discuss how to change the data of the columns with the SQL UPDATE statement using arithmetical expression and SQL WHERE clause and boolean operator AND.
Example:
Sample table: customer1
To change the value of 'outstanding_amt' of 'customer1' table with following conditions -
1. modified value for 'outstanding_amt' is 'outstanding_amt'-('outstanding_amt'*.10),
2. 'cust_country' must be 'India',
3. and 'grade' must be 1,
the following SQL statement can be used :
SQL Code:
UPDATE customer1
SET outstanding_amt=outstanding_amt-(outstanding_amt*.10)
WHERE cust_country='India' AND grade=1;
SQL update columns with arithmetical expression and comparison operator
In the following, we are discussing, how to change the data of the columns with the SQL UPDATE statement using arithmetical expression and COMPARISON operator.
Example:
Sample table: neworder
To change the value of 'advance_amount' of 'neworder' table with the following condition -
1. modified value for 'advance_amount' is 'ord_amount'*.10,
2. 'ord_date' must be greater than '01-Aug-08',
3. and 'ord_date' must be less than '01-Dec-08',
the following SQL statement can be used:
SQL Code:
UPDATE neworder
SET advance_amount=ord_amount*.10
WHERE ord_date>'01-Aug-08' AND ord_date<'01-Dec-08';
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Next: Update columns using sum function and group by
SQL: Tips of the Day
How to request a random row in SQL?
Select a random row with MySQL:
SELECT column FROM table ORDER BY RAND() LIMIT 1
Select a random row with PostgreSQL:
SELECT column FROM table ORDER BY RANDOM() LIMIT 1
Select a random row with Microsoft SQL Server:
SELECT TOP 1 column FROM table ORDER BY NEWID()
Select a random row with IBM DB2:
SELECT column, RAND() as IDX FROM table ORDER BY IDX FETCH FIRST 1 ROWS ONLY
Select a random record with Oracle:
SELECT column FROM ( SELECT column FROM table ORDER BY dbms_random.value ) WHERE rownum = 1
Database: SQL Server, PostgreSQL Server, MySQL
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