You can update boolean value using UPDATE command. If you use the BOOLEAN data type, MySQL internally convert it into tinyint(1). It can takes true or false literal in which true indicates 1 to tinyint(1) and false indicates 0 to tinyint(1).The syntax is as follows −UPDATE yourTableName SET yourColumnName = yourValue WHERE yourCondition;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table UpdateBooleans    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> isSuccessful BOOLEAN,    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows ... Read More

To MySQL order string with numbers, the following is the syntax, wherein we have used ORDER BY, SUBSTR() and CAST() −SELECT *FROM yourTableName ORDER BY SUBSTR(yourColumnName FROM 1 FOR 2), CAST(SUBSTR(yourColumnName FROM 2) AS UNSIGNED);To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table OrderByStringWithNumbers    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> Words varchar(10),    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert ... Read More

You can use CASE statement in MySQL to map keys to values for an individual field in select query. The syntax is as follows −SELECT yourColumnName1, yourColumnName2, yourColumnName3, .........N (    CASE WHEN yourColumnName = 1 THEN 'ENABLED'    ELSE 'DISABLED'    END ) AS anyVariableName FROM yourTableName;You can use IF() function also for the same purpose. The syntax is as follows −SELECT yourColumnName1, yourColumnName2, yourColumnName3, .........N ,IF(yourColumnName, 'ENABLED', 'DISABLED') as anyVariableName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table MapKeys    -> (   ... Read More

Get hash value of each row using MD5() function from MySQL. The syntax is as follows −SELECT MD5(CONCAT(yourColumnName1, yourColumnName2, yourColumnName3, .......N)) as anyVariableName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table getHashValueForEachRow    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> Name varchar(20),    -> Age int,    -> Marks int,    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows affected (1.25 sec)Insert records in the table using insert command. The query is as follows −mysql> insert into getHashValueForEachRow(Name, Age, ... Read More

Convert dd/mm/yyyy string to Unix timestamp with the help of UNIX_TIMESTAMP(). The syntax is as follows −SELECT UNIX_TIMESTAMP(STR_TO_DATE(yourColumnName, '%d/%m/%Y')) as anyVariableName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table ConvertddmmyyyyInUnixTimeStamp    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> Created_at varchar(30),    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into ConvertddmmyyyyInUnixTimeStamp(Created_at) values('10/11/2012'); Query OK, 1 row affected (0.21 sec) mysql> ... Read More

To select a single row in MySQL, you can use LIMIT. At first, let us create a table. The query to create a table is as follows −mysql> create table selectWithPrimaryKey    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> Name varchar(20),    -> Age int,    -> Marks int,    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows affected (0.78 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into selectWithPrimaryKey(Name, Age, Marks) values('Larry', 24, 98); Query OK, 1 row affected (0.15 sec) mysql> insert into ... Read More

You can change the date format in PHP using date() fucntion. The syntax is as follows −date(d/m/Y, yourDateTimeVariable);In PHP, convert string to date using strtodate(). Here is the PHP code used to format the datetime −$LogintDate = strtotime('2019-01-12'); echo date('d/m/Y', $LogintDate);The snapshot of code is as follows −The following is the output −12/01/2019You can achieve in MySQL with the help of date_format() function. The syntax is as follows −SELECT DATE_FORMAT(yourColumnName, ’%d/%m/%Y’) as anyVariableName FROM yourTableName;To understand the above syntax, let us create a table −mysql> create table Date_FormatDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> ... Read More

To find out a varchar contains a percent sign in MySQL, you can use LIKE operator. The syntax is as follows −SELECT * FROM yourTableName WHERE yourColumnName like '%|%%' escape '|';To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table FindPercentInVarcharDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> Words varchar(30),    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows affected (0.51 sec)Insert some records with % sign using insert command. The query is as follows −mysql> insert into FindPercentInVarcharDemo(Words) values('This is ... Read More

To convert the date time to a number in MySQL, the syntax is as follows −SELECT UNIX_TIMESTAMP(yourColumnName) as anyVariableName FROM yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table DateTimeToNumberDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT,    -> releasedDate datetime,    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into DateTimeToNumberDemo(releasedDate) values(now()); Query OK, 1 row affected (0.19 sec) mysql> insert into ... Read More

You can use NULLIF() from MySQL to replace 0 with NULL. The syntax is as follows −SELECT *, NULLIF(yourColumnName, 0) as anyVariableName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table Replace0WithNULLDemo    -> (    -> Id int NOT NULL auto_increment,    -> Name varchar(20),    -> Marks int,    -> PRIMARY KEY(Id)    -> ); Query OK, 0 rows affected (0.53 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into Replace0WithNULLDemo(Name, Marks) values('John', ... Read More