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MySQL Articles
Page 256 of 355
MySQL query to display ASC order in number column?
You can achieve this with the help of CAST() function. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Score int ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Score) values(10); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(Score) values(100); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Score) values(11); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Score) values(97); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Score) values(78); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Score) values(89); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----+-------+ | Id | Score | +----+-------+ | 1 | 10 | ...
Read MoreListing all rows by group with MySQL GROUP BY?
To list all rows by group, you can use GROUP_CONCAT(). Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20), Value varchar(100) ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, Value) values('John', 'John'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Name, Value) values('Carol', 'Carol'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(Name, Value) values('John', 'Works'); Query OK, 1 row affected (0.13 sec) mysql> insert ...
Read MoreHow can I order in group but randomly with MySQL?
Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Value char(1) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values('X'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Value) values('Y'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(Value) values('X'); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable(Value) values('X'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(Value) values('Y'); Query OK, 1 ...
Read MoreHow to get MySQL combined field result?
You can use CONCAT() function from MySQL for this. Let us first create a table −mysql> create table DemoTable ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientFirstName varchar(20), ClientLastName varchar(20) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ClientFirstName, ClientLastName) values('John', 'Smith'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(ClientFirstName, ClientLastName) values('John', 'Miller'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(ClientFirstName, ClientLastName) values('Carol', 'Taylor'); Query OK, 1 row affected (0.13 sec) mysql> insert into ...
Read MoreNew line separator doesn't work for group_concat function in MySQL? How to use it correctly?
To use new line separator in group_concat() function, follow the below syntax −select group_concat(concat_ws(' ', yourColumnName1, yourColumnName2) SEPARATOR "\r") from yourTableName;Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20), LastName varchar(20) ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName, LastName) values('John', 'Smith'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(FirstName, LastName) values('David', 'Miller'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(FirstName, LastName) values('John', 'Doe'); ...
Read MorePreserve select order within MySQL UNION?
It’s a good choice to use CASE statement. Do not use UNION. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, ShippingDate datetime ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ShippingDate) values('2019-04-21'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(ShippingDate) values('2019-01-01'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(ShippingDate) values('2019-05-11'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(ShippingDate) values('2018-12-31'); Query OK, 1 row ...
Read MoreImplement Conditional MySQL Query in a stored procedure?
For conditional MySQL query, you can use IF ELSE concept in stored procedure. Let us first create a table −mysql> create table DemoTable1 ( Id int ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(10); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1 values(20); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1 values(30); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;This will produce the following output ...
Read MoreHow to prevent a user from accessing a specific schema in MySQL?
To prevent a user from accessing a specific schema, you need to use delete command. Following is the syntax −DELETE FROM mysql.db WHERE Db IN("yourSpecificSchema", "yourSpecificSchema\_%") AND User = "yourUserName" AND Host = "yourHostName";Let us implement the above syntax to prevent a user from accessing a specific schema. First of all, let us display all users and host from MySQL.user table.mysql> select user, host from MySQL.user;This will produce the following output −+------------------+-----------+ | user | host | +------------------+-----------+ | Bob | % ...
Read MoreHow to search by specific pattern in MySQL?
You can use regular expression for this. Let us first create a table −mysql> create table DemoTable ( UserId varchar(100) ); Query OK, 0 rows affected (1.28 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('User-123-G'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Us-453-GO'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('TRUE-908-K'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------------+ | UserId | ...
Read MoreHow to make MySQL table primary key auto increment?
To make MySQL table primary key auto increment, use the below syntaxCREATE TABLE yourTableName ( yourColumnName INT(6) ZEROFILL NOT NULL AUTO_INCREMENT, PRIMARY KEY(yourColumnName) );Let us first create a table and set primary key auto increment −mysql> CREATE TABLE DemoTable ( UserId INT(6) ZEROFILL NOT NULL AUTO_INCREMENT, PRIMARY KEY(UserId) ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.12 sec) mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.13 sec) mysql> INSERT ...
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