You can add a temporary column with value with the help of the following syntax −select yourColumnName1, yourColumnName2, .....N ,yourTemporaryColumnValue as yourTemporaryColumnName from yourTableName;To add a temporary column with a value, let us create a table. The following is the query −mysql> create table TemporaryColumnWithValueDemo    −> (       −> StudentId int,       −> StudentName varchar(100)    −> ); Query OK, 0 rows affected (0.59 sec)Inserting some records in the table. The query to insert records are as follows −mysql> insert into TemporaryColumnWithValueDemo values(101, 'John'); Query OK, 1 row affected (0.13 sec) mysql> insert into ... Read More

You can find the highest number in a column with the help of aggregate function MAX. The syntax is as follows −select max(yourColumnName) as anyVariableName from yourTableName;To understand the above concept, let us create a table with an int column. The following is the query to create a table.mysql> create table HighestNumberDemo    −> (       −> BigNumber int    −> ); Query OK, 0 rows affected (0.87 sec)Now insert some values in the table. The query to insert records are as follows −mysql> insert into HighestNumberDemo values(1234); Query OK, 1 row affected (0.43 sec) mysql> insert ... Read More

To toggle a value of an int field, you can use update command with if(). The syntax is as follows −update yourTableName set yourColumnName = IF(yourColumnName = 0, 1, 0);To understand the above toggle syntax, create a table with some int value. The query to create a table is as follows −mysql> create table ToggleDemo    −> (       −> IsOnOrOff int    −> ); Query OK, 0 rows affected (0.53 sec)Let us insert int values in the table with the help of insert command. The query is as follows −mysql> insert into ToggleDemo values(1); Query OK, 1 ... Read More

Subtract 3 hours from DateTime in MySQL, using any of the following ways. The first approach is as follows −Case 1 − Using DATE_ADD()select date_add(yourColumnName, interval -3 hours) from yourTableName;Case 2 − Using DATE_SUB()select date_sub(yourColumnName, interval 3 hours) from yourTableName;Firstly, use now() to get the current date-time −mysql> select now();The following is the output −+---------------------+ | now()               | +---------------------+ | 2018-11-30 10:13:23 | +---------------------+ 1 row in set (0.00 sec)DATE_ADDThe query to subtract 3 hours from DateTime is as follows. With date_add, we have set a negative date −mysql> select date_add(now(), interval -3 ... Read More

You will get this type of error when your MySQL version is below 5.5.3. This is because “utf8mb4” introduced in MySQL version 5.5.3.Firstly, you need to check the current version. If its less than 5.5.3, then you need to upgrade to solve the above error.Check the current version −mysql> select version();Here, our MySQL version is over 5.5.3 −+-----------+ | version() | +-----------+ | 8.0.12    | +-----------+ 1 row in set (0.00 sec)Now the same query that gave an error 1115, will display correct result. To check all character set in MySQL now, use the below query.mysql> show character set;The ... Read More

First you need to reach the location of “my.cnf” with the help of below query for MySQL Utilities. The query is as follows −mysql> select @@datadir;The following is the output that display where “my.conf” is −+---------------------------------------------+ | @@datadir                                   | +---------------------------------------------+ | C:\ProgramData\MySQL\MySQL Server 8.0\Data\ | +---------------------------------------------+ 1 row in set (0.00 sec)Follow the above path in order to open the “my.cnf” file. The snapshot of “my.cnf” location is as follows −Now you can put the below MySQL Utilities in my.cnf which is as ... Read More

Use the STR_TO_DATE() function from MySQL to set a date format for displaying DD/MM/YYYY date. The syntax is as follows −SELECT STR_TO_DATE(yourColumnName, ’%d/%m/%Y) as anyVariableName from yourTableName.To understand the above syntax, let us create a table −mysql> create table DateFormatDemo    −> (       −> IssueDate varchar(100)    −> ); Query OK, 0 rows affected (0.54 sec)Inserting some string dates into the table. The query to insert date is as follows −mysql> insert into DateFormatDemo values('26/11/2018'); Query OK, 1 row affected (0.14 sec) mysql> insert into DateFormatDemo values('27/11/2018'); Query OK, 1 row affected (0.18 sec) mysql> ... Read More

To fetch fields with multiple values, use LIKE with OR in MySQL −select *from yourTableName where yourColumnName like ‘%AnyStringValue’ or yourColumnName like ‘%AnyStringValue’ or yourColumnName like ‘%AnyStringValue’ ……...N;You can understand with the help of a table −mysql> create table LikeDemo    −> (       −> Hobby varchar(200)    −> ); Query OK, 0 rows affected (1.71 sec)Insert some records in the table with the help of insert command. The query to insert records in the table is as follows −mysql> insert into LikeDemo values('Reading Book'); Query OK, 1 row affected (0.13 sec) mysql> insert into LikeDemo values('Playing ... Read More

You can get timestamp with the help of current_timestamp, now() and current_timestamp().Case 1 − Using current_timestamp()The query is as follows −mysql> SELECT CURRENT_TIMESTAMP();The following is the output displaying timestamp −+---------------------+ | CURRENT_TIMESTAMP() | +---------------------+ | 2018-11-29 16:09:31 | +---------------------+ 1 row in set (0.00 sec)Case 2 − Using now()The query is as follows −mysql> select now();The following is the output −+---------------------+ | now()               | +---------------------+ | 2018-11-29 16:09:38 | +---------------------+ 1 row in set (0.00 sec)You can get integer UNIX timestamp with the help of below query −mysql> select unix_timestamp();The following is the ... Read More

To skip first 10 results, use “limit offset”. The syntax is as follows −select *from yourTableName limit 10 offset lastValue;Let us create a table to understand the above syntax. The following is the query to create a table −mysql> create table SkipFirstTenRecords    −> (       −> StudentId int,       −> StudentName varchar(200)    −> ); Query OK, 0 rows affected (0.53 sec)Now you can insert some records in the table with the help of insert command. The query is as follows −mysql> insert into SkipFirstTenRecords values(100, 'John'); Query OK, 1 row affected (0.12 sec) ... Read More