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MySQL Articles
Page 53 of 355
How can I update the boolean values in MySQL?
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 MoreIs `definer` required when creating a MySQL stored procedure?
No, definer part is not compulsory when you are creating a stored procedure. It is used when you want to create a definer.Check all the user and host from the MySQL.user table −mysql> select user, host from mysql.user;The following is the output −+------------------+-----------+ | user | host | +------------------+-----------+ | Manish | % | | User2 | % | | mysql.infoschema | % | | mysql.session | % ...
Read MoreMySQL select * with distinct id?
You can use GROUP BY command for select with distinct id. The syntax is as follows −SELECT *FROM yourTableName GROUP BY yourColumnName;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table DistinctIdDemo -> ( -> Id int, -> Name varchar(20), -> Age int -> ); Query OK, 0 rows affected (1.03 sec)Insert some records in the table using insert command. Here, we have added ID with duplicate values.The query is as follows −mysql> insert into DistinctIdDemo values(1, 'Mike', 23); Query OK, 1 row ...
Read MoreMySQL BETWEEN without the beginning and endpoints?
If you do not want to include start and end value in between, then use the following syntax −SELECT * FROM yourTableName WHERE yourColumnName BETWEEN yourStartingValue and yourEndingValue and yourColumnName not in (yourStartingValue , yourEndingValue );To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table BetweenWithoutEndPoints -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> Age int, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.54 sec)Now you can insert some records in the table using ...
Read MoreSelect distinct combinations from two columns in MySQL?
To select distinct combinations from two columns, you can use CASE statement. Let us create a table with some columns.The query to create a table is as follows −mysql> create table select_DistinctTwoColumns -> ( -> Id int NOT NULL AUTO_INCREMENT, -> FirstValue char(1), -> SecondValue char(1), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.57 sec)Now you can insert some records in the table using insert command. The query is as follows −mysql> insert into select_DistinctTwoColumns(FirstValue, SecondValue) values('s', 't'); Query OK, 1 row affected (0.12 sec) mysql> insert into select_DistinctTwoColumns(FirstValue, SecondValue) ...
Read MoreInsert sequential number in MySQL?
You can insert sequential number in MySQL using session variable. The syntax is as follows −SELECT @anyVariableName − = anyIntegerValue; UPDATE yourTableName SET yourColumnName = @anyVariableName − = @anyVariableName+IncrementStep;To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table SequentialNumberDemo -> ( -> SequentialNumber int not null -> ); Query OK, 0 rows affected (0.84 sec)Insert records in the table using insert command. The query is as follows −mysql> insert into SequentialNumberDemo values(100); Query OK, 1 row affected (0.11 sec) mysql> insert into SequentialNumberDemo values(10); ...
Read MoreOrder by last 3 chars in MySQL?
You can use ORDER BY RIGHT() function to order by last 3 chars in MySQL. The syntax is as follows −SELECT *FROM yourTableName ORDER BY RIGHT(yourColumnName, 3) yourSortingOrder;Just replace the ‘yourSortingOrder’ to ASC or DESC to set the ascending or descending order respectively.To understand the above syntax, let us create a table. The query to create a table is as follows −mysql> create table OrderByLast3Chars -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT, -> EmployeeName varchar(20), -> EmployeeAge int, -> PRIMARY KEY(EmployeeId) -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in ...
Read MoreHow to add static value while INSERT INTO with SELECT in a MySQL query?
You can add static value when you use INSERT INTO SELECT MySQL query. Write the value directly in the select statement or you can add with the help of variable which initializes the value.Case 1 − Place the value directly in the INSERT INTO SELECT statement. The syntax is as follows −INSERT INTO yourSecondTableName(yourColumnName1, yourColumnName2, ....N) SELECT yourColumnName1 ,yourColumnName2, .....N, yourStaticValue from yourFirstTableName;Case 2 − Add using variable. The syntax is as follows −SET @yourVariableName − = yourstaticValue; INSERT INTO yourSecondTableName(yourColumnName1, yourColumnName2, ....N) SELECT yourColumnName1 ,yourColumnName2, .....N, @yourVariableName from yourFirstTableName;To understand the above syntax, you need to ...
Read MoreHow to Insert custom date into MySQL timestamp field?
The problem with UNIX_TIMESTAMP() function is that it returns an integer while we want to insert custom date i.e. not any integer part to MySQL date.Do not use UNIX_TIMESTAMP() for your column defined as TIMESTAMP because UNIX_TIMESTAMP() returns an integer.Check the UNIX_TIMESTAMP. The query is as follows −mysql> select UNIX_TIMESTAMP( '2019-01-09 15 −48 −23') AS IntegerValue;The following is the output −+--------------+ | IntegerValue | +--------------+ | 1547029103 | +--------------+ 1 row in set (0.00 sec)Look at the sample output, the UNIX_TIMESTAMP() function returns an integer of corresponding date and time.The syntax is as follows to insert custom date for ...
Read MoreMySQL - SELECT ... WHERE id IN (..) order with particular column?
You can SELECT ….WHERE id IN(..) using field() function to order with any column. The syntax is as follows −SELECT *FROM yourTableName WHERE yourColumnName IN(‘value1’, ’value2’, .......N) ORDER BY FIELD(yourColumnName, value1’, ’value2’, .......N);To understand the above syntax, let us create a table −mysql> create table SelectOrderbyField -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(30), -> Age int, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into SelectOrderbyField(Name, Age) values('John', 23); Query OK, ...
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