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MySQL Articles
Page 152 of 355
Add a single year to all the date records in a MySQL table column
Let us first create a table −mysql> create table DemoTable -> ( -> JoiningDate datetime -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2015-01-21'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2017-04-02'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('2018-12-31'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------------+ | JoiningDate | +---------------------+ | 2015-01-21 00:00:00 ...
Read MorePlacing comments in the middle of a create table statement? Is it possible?
Yes, it is possible using the # symbol. Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY , # Creating a sequence Number -> FirstName varchar(20), # Creating a column to store name -> Age int # creating a column to store an age -> ); Query OK, 0 rows affected (1.43 sec)Above, we have set comments using the # symbol. Insert some records in the table using insert command. We will set comments in insert statement as well using the same # symbol ...
Read MoreMySQL update multiple records in a single query?
Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Marks1 int, -> Marks2 int, -> Marks3 int -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Marks1, Marks2, Marks3) values(45, 67, 34); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable(Marks1, Marks2, Marks3) values(89, 87, 56); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(Marks1, Marks2, Marks3) values(87, 56, 54); Query OK, 1 row affected (0.31 sec)Display ...
Read MoreFind out the popular domains from a MySQL table with domain records and search volume
For this, you can use GROUP BY along with the ORDER BY clause. Let us first create a table &mins;mysql> create table DemoTable -> ( -> URL varchar(40), -> DomainName varchar(20), -> SearchTimes int -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('www.gmail.com', 'gmail.com', 4); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('www.google.com', 'google.com', 3); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('www.gmail.com', 'gmail.com', 9); Query OK, 1 row affected (0.15 sec) mysql> insert ...
Read MoreHow to display the storage engine while implementing JDBC - MySQL CONNECTION query?
Use SELECT ENGINE to display the storage engine name. Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> Age int, -> CountryName varchar(20) -> ); Query OK, 0 rows affected (0.63 sec)Here is the Java code to get the storage engine using JDBC −Exampleimport java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class GetTheStorageEngine { public static void main(String[] args) { String hostURL = "jdbc:mysql://localhost:3306/web?useSSL=false"; Connection con = null; ...
Read MoreGet last second of a date in MySQL?
To get the last second of a date in MySQL, use the INTERVAL command. Let us first create a table −mysql> create table DemoTable -> ( -> JoiningDatetime datetime, -> DueDatetime datetime -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(JoiningDatetime) values('2019-11-03 12:34:54'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(JoiningDatetime) values('2019-10-04 12:34:54'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------------+-------------+ | JoiningDatetime ...
Read MoreText manipulation of strings containing "The "? in MySQL
You can use ORDER BY TRIM(). Let us first create a table −mysql> create table DemoTable -> ( -> Title text -> ); Query OK, 0 rows affected (1.09 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('MongoDB is a no SQL database'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('The MySQL is a relational database'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('The Java language is good'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable values('Python is good language'); Query ...
Read MoreFix Connectivity error in Java MySQL connection for connector to be set to class path?
To fix, you need to put MySQL connector to the Java classpath. Import the jar file of the connector to the project folder for the IDE you are using.Here is the snapshot to place classpath −Let us now see the code for connectivity in Java with MySQL −This will produce the following output −
Read MoreHow to replace a character in a MySQL table?
To replace only a single character, use REPLACE() in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John Smitk'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('David Miller'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Adam Smitk'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following ...
Read MoreHow to implement MySQL ORDER BY x where (x=col3 if col3!=null, else x=col2)?
For this, you can use ORDER BY IFNULL(). Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20), -> CountryName varchar(20) -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', NULL); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('David', 'AUS'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(NULL, 'UK'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(NULL, 'AUS'); Query OK, 1 row affected (0.10 sec) mysql> ...
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