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How do I add to each row in MySQL?
You can add a value to each row in MySQL using UPDATE command.
Let us see when your column is an integer. The syntax is as follows:
UPDATE yourTableName SET yourIntegerColumnName = yourIntegerColumnName+anyValue; UPDATE yourTableName SET yourIntegerColumnName = anyValue WHERE yourIntegerColumnName IS NULL;
You can add a value for a date column name. The syntax is as follows:
UPDATE yourTableName SET yourDateColumnName = DATEADD(yourDateColumnName,INTERVAL anyIntegerMonth)
To understand the above syntax, let us create a table. The query to create a table is as follows:
mysql> create table addEachRowValue -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Amount int, -> ShippingDate date, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.50 sec)
Insert some records in the table using insert command. The query is as follows:
mysql> insert into addEachRowValue(Amount,ShippingDate) values(100,'2019-02-21'); Query OK, 1 row affected (0.15 sec) mysql> insert into addEachRowValue(Amount,ShippingDate) values(10,'2013-04-22'); Query OK, 1 row affected (0.19 sec) mysql> insert into addEachRowValue(Amount,ShippingDate) values(110,'2015-10-25'); Query OK, 1 row affected (0.15 sec) mysql> insert into addEachRowValue(Amount,ShippingDate) values(150,'2016-03-27'); Query OK, 1 row affected (0.29 sec) mysql> insert into addEachRowValue(Amount,ShippingDate) values(190,'2018-12-29'); Query OK, 1 row affected (0.20 sec)
Display all records from the table using select statement. The query is as follows:
mysql> select *from addEachRowValue;
The following is the output:
+----+--------+--------------+ | Id | Amount | ShippingDate | +----+--------+--------------+ | 1 | 100 | 2019-02-21 | | 2 | 10 | 2013-04-22 | | 3 | 110 | 2015-10-25 | | 4 | 150 | 2016-03-27 | | 5 | 190 | 2018-12-29 | +----+--------+--------------+ 5 rows in set (0.00 sec)
Here is the query to add a value to each row in Amount column which is a type of integer:
mysql> update addEachRowValue -> set Amount=Amount+20; Query OK, 5 rows affected (0.85 sec) Rows matched: 5 Changed: 5 Warnings: 0
Now you can check all updated values of Amount column. The query is as follows:
mysql> select Amount from addEachRowValue;
The following is the output:
+--------+ | Amount | +--------+ | 120 | | 30 | | 130 | | 170 | | 210 | +--------+ 5 rows in set (0.00 sec)
Here is the query to add a value for a date column:
mysql> update addEachRowValue -> set ShippingDate=adddate(ShippingDate,interval 1 month); Query OK, 5 rows affected (0.31 sec) Rows matched: 5 Changed: 5 Warnings: 0
Now you can check all updated values of date column from a table. The query is as follows:
mysql> select ShippingDate from addEachRowValue;
The following is the output:
+--------------+ | ShippingDate | +--------------+ | 2019-03-21 | | 2013-05-22 | | 2015-11-25 | | 2016-04-27 | | 2019-01-29 | +--------------+ 5 rows in set (0.00 sec)
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