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MySQL Articles
Page 177 of 355
How to sum the values in the table by month with MySQL?
For this, use EXTRACT(), that would allow you to extract specific month records. For example, to add all the prices in January (irrespective of the year).Let us first create a −mysql> create table DemoTable1415 -> ( -> ProductPurchaseDate date, -> ProductPrice int -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert −mysql> insert into DemoTable1415 values('2019-01-12', 560); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1415 values('2018-01-14', 1060); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1415 values('2017-03-21', 780); Query OK, 1 row affected (0.11 ...
Read MoreSelect multiple Book Titles that share the minimum (PRICE) value in MySQL?
For this, use MySQL MIN(). Let us first create a −mysql> create table DemoTable1414 -> ( -> BookTitle varchar(40), -> BookPrice int -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert −mysql> insert into DemoTable1414 values('Deep dive using java', 560); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1414 values('C++ in depth', 360); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1414 values('Data structure in C', 590); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1414 values('Algorithm in C++', 1090); Query OK, 1 ...
Read MoreFastest way to search for a date from the date records in MySQL
The fastest and easiest way is to use the MySQL BETWEEN keyword. Let us first create a −mysql> create table DemoTable1413 -> ( -> EmployeeName varchar(20), -> EmployeeJoiningDate datetime -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert −mysql> insert into DemoTable1413 values('Chris', '2018-09-28 11 :10 :50'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable1413 values('David', '2019-09-28 11:10:50'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1413 values('Mike', '2019-09-29 12:40:00'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1413 values('Carol', '2019-09-28 12:06:10'); ...
Read MoreMySQL query to check if a certain row has only two words?
For this, use Regular Expression in MySQL as in the below syntax −select * from yourTableName where yourColumnName regexp '^[^ ]+[ ]+[^ ]+$';The above query will work when the two words are separated by a space. Let us first create a −mysql> create table DemoTable1412 -> ( -> Name varchar(40) -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert −mysql> insert into DemoTable1412 values('John Adam Carol'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1412 values('Mike Sam'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1412 ...
Read MoreMySQL query to find a value in a set of values separated by comma in a custom variable
For this, use FIND_IN_SET() in MySQL and use the value from a custom variable. Let us first create a −mysql> create table DemoTable1411 -> ( -> Value int -> ) -> ; Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert −mysql> insert into DemoTable1411 values(10); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1411 values(50); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1411 values(60); Query OK, 1 row affected (0.08 sec)Display all records from the table using select −mysql> select * from DemoTable1411;This will produce ...
Read MoreHow to mask data fields in MySQL?
To mask data fields, use CONCAT() along with REPEAT(). Here, we will mask data fields with #. Let us first create a −mysql> create table DemoTable1410 -> ( -> Password varchar(80) -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert −mysql> insert into DemoTable1410 values('John12345678'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1410 values('Carol_897'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1410 values('David_5647383'); Query OK, 1 row affected (0.17 sec)Display all records from the table using select −mysql> select * from DemoTable1410;This will produce ...
Read MoreHow to add duplicate varchar values without displaying error in MySQL?
For this, let us see an example and first create a −mysql> create table DemoTable1409 -> ( -> FirstName varchar(20), -> UNIQUE KEY UN_FirstName(FirstName) -> ); Query OK, 0 rows affected (0.79 sec)Following is the query to add duplicate varchar −mysql> alter table DemoTable1409 drop index UN_FirstName; Query OK, 0 rows affected (0.40 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert −mysql> insert into DemoTable1409 values('Chris'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1409 values('Chris'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1409 values('David'); ...
Read MoreHow to include quotes in comma separated column with MySQL?
Let us first create a −mysql> create table DemoTable1407 -> ( -> Name text -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert −mysql> insert into DemoTable1407 values('John, Bob'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1407 values('Carol, David, Adam'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1407 values('Mike, Sam, Chris'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select −mysql> select * from DemoTable1407;This will produce the following output −+------------------+ | Name ...
Read MoreUsing the entire expression in MySQL WHERE clause?
Let us see an example and create a −mysql> create table DemoTable1406 -> ( -> Value int -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert −mysql> insert into DemoTable1406 values(10); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1406 values(50); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1406 values(40); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable1406 values(30); Query OK, 1 row affected (0.11 sec)Display all records from the table using select −mysql> select * from DemoTable1406;This will produce the following ...
Read MoreUpdate all rows in MySQL and remove all the unnecessary whitespaces in and around the string?
To remove unnecessary whitespaces, use TRIM() in MySQL. Let us first create a −mysql> create table DemoTable1405 -> ( -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert −mysql> insert into DemoTable1405 values(' Chris', ' Brown '); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1405 values('David ', ' Miller '); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable1405 values(' Carol ', ' Taylor '); Query OK, 1 row affected (0.19 sec)Display all ...
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