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Articles by AmitDiwan
Page 776 of 840
Implement MySQL trigger in the first table to insert records in the second table?
For this, the syntax is as follows −DELIMITER // create trigger yourTriggerName before insert on yourTableName1 for each row begin insert into yourTableName2 values (yourValue1, yourValue2, ...N); end ; // DELIMITER ;Let us first create a table −mysql> create table DemoTable1 ( StudentId int, StudentName varchar(40) ); Query OK, 0 rows affected (0.69 sec)Here is the query to create second table −mysql> create table DemoTable2( Id int, Name varchar(40) ); Query OK, 0 rows affected (0.61 sec)Here is the query for trigger before insert −mysql> DELIMITER // mysql> create trigger ...
Read MoreMySQL query to select date from 00:00 to today's date
Let’s say the current date is 2019-09-14 8 :50 :10. Now, we want records from 00 :00 to 2019-09-14 8 :50 :10. Let us now see an example and create a table −mysql> create table DemoTable ( DueDate datetime ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-09-14'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('2019-09-14 8 :00 :10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('2019-09-14 8 :44 :00'); Query OK, 1 row affected (0.14 sec) mysql> insert ...
Read MoreExclude some ID records from a list and display rest in MySQL
To exclude records, use MySQL NOT IN(). Let us first create a table −mysql> create table DemoTable ( Id int ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(2); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(3); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(4); Query OK, 1 row affected (0.41 sec) mysql> insert into DemoTable values(5); Query OK, 1 row affected (0.09 sec) mysql> insert into ...
Read MoreA single MySQL query to update only specific records in a range without updating the entire column
Let us first create a table −mysql> create table DemoTable ( Name varchar(40), Position int ); Query OK, 0 rows affected (1.17 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 90); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('David', 67); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Bob', 55); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Sam', 40); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the ...
Read MoreMySQL query to find a match and fetch records
To find a match from records, use MySQL IN(). Let us first create a table −mysql> create table DemoTable ( Id int, FirstName varchar(20), Gender ENUM('Male', 'Female') ); Query OK, 0 rows affected (1.73 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, 'Chris', 'Male'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable values(10, 'Emma', 'Female'); Query OK, 1 row affected (1.88 sec) mysql> insert into DemoTable values(9, 'Emma', 'Male'); Query OK, 1 row affected (0.70 sec) mysql> insert into DemoTable values(11, 'Isabella', 'Female'); Query OK, 1 row affected ...
Read MoreSearch for specific characters within a string with MySQL?
For this, use REGEXP. For example, characters J, A, V and A. Let us first create a table −mysql> create table DemoTable ( Value varchar(50) ); Query OK, 0 rows affected (3.92 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('XYSJGHAKLMVDFFSA'); Query OK, 1 row affected (0.67 sec) mysql> insert into DemoTable values('PQRSTJAVAL'); Query OK, 1 row affected (0.58 sec) mysql> insert into DemoTable values('SJATUVAK'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('JSTUVA'); Query OK, 1 row affected (0.32 sec)Display all records from the table using select statement −mysql> select ...
Read MoreCount values greater and less than a specific number and display count in separate MySQL columns?
For this, you can use COUNT() along with CASE STATEMENT. Let us first create a table −mysql> create table DemoTable ( Score int ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.77 sec) mysql> insert into DemoTable values(48); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(59); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(33); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(38); Query OK, 1 row affected (0.09 sec) ...
Read MoreHow to select a specific record from MySQL if date is in VARCHAR format?
For this, use STR_TO_DATE(). Let us first create a table −mysql> create table DemoTable ( DueDate varchar(60) ) ; Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('12-AUG-2016'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('14-AUG-2018'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('24-AUG-2012'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('14-AUG-2012'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output ...
Read MoreCan I search for particular numbers in a MySQL column with comma separated records using a MySQL query?
Yes, you can search for particular numbers using the MySQL FIND_IN_SET(). Let us first create a table −mysql> create table DemoTable ( ListOfNumbers varchar(100) ); Query OK, 0 rows affected (1.24 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('784, 746, 894, 344'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('456, 322, 333, 456'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('654, 785, 678, 456'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable values('123, 676, 847, 785'); Query OK, 1 row affected (0.34 ...
Read MoreMySQL query to group concat and place data into a single row on the basis of 1 values in corresponding column?
For this, use GROUP_CONCAT(). For only 1 values, work with MySQL WHERE clause. Let us first create a table −mysql> create table DemoTable ( PlayerName varchar(40), PlayerStatus tinyint(1) ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 1); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('David', 0); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Sam', 1); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Carol', 1); Query OK, 1 row affected (0.12 sec) mysql> insert ...
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