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Database Articles
Page 372 of 547
How to search for the exact string value in MySQL?
To search for the exact string value, use the concept of COLLATE. Let us first create a table −mysql> create table DemoTable1620 -> ( -> Subject varchar(20) -> ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1620 values('mysql'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1620 values('MySql'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1620 values('mYSQL'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1620 values('MySQL'); Query OK, 1 row affected (0.26 sec) mysql> insert ...
Read MoreHow can I enhance my select query to make it faster in MySQL?
For quicker querying, use MySQL IN() because it uses indexing internally. Let us first create a table −mysql> create table DemoTable1618 -> ( -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientName varchar(20), -> ClientEmailId varchar(30) -> ); Query OK, 0 rows affected (1.53 sec)Insert some records in the table using insert command:mysql> insert into DemoTable1618(ClientName, ClientEmailId) values('Chris Brown', 'Brown323@gmail.com'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1618(ClientName, ClientEmailId) values('David Miller', 'MillerDavid@gmail.com'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1618(ClientName, ClientEmailId) values('John Doe', ...
Read MoreCreate a Stored Procedure with MySQL and set a limit to display only a specific number of records
Let us first create a table −mysql> create table DemoTable1368 -> ( -> ClientId int, -> ClientName varchar(20) -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1368 values(101, 'Adam'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1368 values(102, 'Bob'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1368 values(103, 'John'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1368 values(104, 'Sam'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1368 values(105, ...
Read MoreFind specific records which has whitespace on the second place in MySQL
For this, use SUBSTR() as in the below syntax −select * from yourTableName where substr(yourColumnName, 2, 1 ) = ' ';Let us first create a table −mysql> create table DemoTable1365 -> ( -> Value varchar(20) -> ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1365 values('9756757474'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1365 values('3 45322333'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1365 values('8974646363'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1365 values('9 ...
Read MoreUsing MySQL IN() for some column values with underscore
Let us first create a table −mysql> create table DemoTable1363 -> ( -> StudentId varchar(20) -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1363 values('901'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1363 values('702'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1363 values('901_John_Doe'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1363 values('1001_Carol_Taylor'); Query OK, 1 row affected (0.26 sec)Display all records from the table using select statement −mysql> select * from DemoTable1363;This will ...
Read MoreMySQL permissions to view all databases?
For this, the syntax is as follows −revoke show databases on *.* from 'yourUserName'@'yourHostName';Let us display all usernames along with host name −mysql> select user, host from MySQL.user;This will produce the following output −+------------------+-----------+ | user | host | +------------------+-----------+ | Bob | % | | Charlie | % | | Robert | % | | User2 | % ...
Read MoreCreate variables in MySQL stored procedure with DECLARE keyword
Use MySQL DECLARE for variables in stored procedure −DECLARE anyVariableName int DEFAULT anyValue;Let us implement the above syntax in order to create variables in stored procedure −mysql> DELIMITER // mysql> CREATE PROCEDURE variable_Demo() -> BEGIN -> DECLARE lastInsertedId int DEFAULT -1; -> select lastInsertedId; -> set @providedLastId=10001; -> select @providedLastId; -> END -> // Query OK, 0 rows affected (0.32 sec) mysql> DELIMITER ;Now you can call the above stored procedure using CALL command −mysql> call variable_Demo();This will produce the following output −+----------------+ | lastInsertedId | ...
Read MoreTreat a MySQL column field as NULL if it is blank?
Let us first create a table −mysql> create table DemoTable1362 -> ( -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientName varchar(40) -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1362(ClientName) values('Chris'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1362(ClientName) values(' '); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable1362(ClientName) values('Bob'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1362(ClientName) values(' '); Query OK, 1 row affected (0.12 sec) mysql> insert ...
Read MoreDelete URLs with specific domains from MySQL database?
To delete URLs with specific domains, use DELETE and LIKE clause.Let us first create a table −mysql> create table DemoTable1361 -> ( -> URL text -> ) ; Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1361 values('Https://www.google.com//?id=1'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1361 values('Https://www.facebook.com//?id=2&name=John'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1361 values('Https://www.yahoo.com//?id=3'); Query OK, 1 row affected (0.31 sec) mysql> insert into DemoTable1361 values('Https://www.google.com//?id=1'); Query OK, 1 row affected (0.16 sec)Display all records from ...
Read MoreGet current year in MySQL WHERE clause?
To get current year, use YEAR() along with CURDATE(). Let us first create a table −mysql> create table DemoTable1360 -> ( -> JoiningYear int -> ) -> ; Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1360 values(1998); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1360 values(2018); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable1360 values(2016); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1360 values(2019); Query OK, 1 row affected (0.13 sec) mysql> ...
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