Finding Number of Occurrences of a Specific String in MySQL

karthikeya Boyini
Updated on 30-Jun-2020 12:02:21

623 Views

Use LENGTH() for this. Let us first create a table −mysql> create table DemoTable -> ( -> Value text -> ); Query OK, 0 rows affected (0.74 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10, 20, 10, 30, 10, 40, 50, 40'); Query OK, 1 row affected (0.24 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------------------+ | Value | +-------------------------+ | 10, 20, 10, 30, ... Read More

How to See What a MySQL View Is Made Of

karthikeya Boyini
Updated on 30-Jun-2020 11:54:49

183 Views

Following is the syntax −show create view yourViewName;Let us first create a table −mysql> create table DemoTable -> ( -> StudentName varchar(20) -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following output −+-------------+ | StudentName | +-------------+ | ... Read More

Order By Two Fields and Null Values in MySQL

Sharon Christine
Updated on 30-Jun-2020 11:51:42

264 Views

Let us first create a table −mysql> create table DemoTable -> ( -> FirstName varchar(100), -> LastName varchar(100) -> ); Query OK, 0 rows affected (1.39 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Sam', 'Brown'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(null, 'Smith'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('David', 'Taylor'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values('Mike', null); Query OK, 1 row affected (0.45 sec)Display all records from the table using select statement −mysql> select ... Read More

MySQL DATE_ADD to Increment a Date Based on Another Column

Sharon Christine
Updated on 30-Jun-2020 11:47:25

786 Views

Let us first create a table with one of the columns as DueDate and another one “RepeatTime, which displays how many times, let’s say a user was reminded to submit the payment −mysql> create table DemoTable    -> (    -> DueDate date,    -> RepeatTime int    -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-23', 3); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2019-06-22', 6); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('2019-03-28', 2); Query ... Read More

Change MySQL Column to Have Not Null Constraint

Sharon Christine
Updated on 30-Jun-2020 11:45:00

679 Views

To update the constraint, use the MODIFY command. Following is the syntax −alter table yourTableName modify yourExistingColumnName yourExistingDataType NOT NULL;  Let us first create a table −mysql> create table DemoTable    -> (    -> UserId int NOT NULL AUTO_INCREMENT,    -> UserFirstName varchar(100),    -> UserLastName varchar(100),    -> UserEmailId varchar(100),    -> UserPassword varchar(100),    -> PRIMARY KEY(UserId)    -> ); Query OK, 0 rows affected (0.91 sec)Following is the query to change the constraint of a column to NOT NULL −mysql> alter table DemoTable modify UserFirstName varchar(100) NOT NULL; Query OK, 0 rows affected (2.13 sec) Records: ... Read More

Default Order by Value in MySQL

Sharon Christine
Updated on 30-Jun-2020 11:35:40

242 Views

There is no default ORDER BY value in MySQL. You need to specify ORDER BY clause explicitly. Following is the syntax −ORDER BY ASC; OR ORDER BY DESC;Let us first create a table −mysql> create table DemoTable    -> (    -> StudentName varchar(100)    -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Sam'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.15 sec) ... Read More

Calculate Salary by Getting the Difference Between Dates in MySQL

karthikeya Boyini
Updated on 30-Jun-2020 11:33:42

407 Views

Let’s say you need to get the difference between dates (JoiningDate – EndDate) of a month i.e. days to calculate the salary. The daily-wage salary is let’s say 300; therefore for 20 days, it will 6000. In the same way, for 27 days, it will be 8100.For our example, let us first create a tablemysql> create table DemoTable    -> (    -> JoinDate date,    -> EndDate date    -> ,    -> Value int    -> ); Query OK, 0 rows affected (1.16 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-01', '2019-01-31', ... Read More

Select Multiple Columns and Display in a Single Column in MySQL

karthikeya Boyini
Updated on 30-Jun-2020 11:30:41

5K+ Views

Use concat() for this. Let us first create a table −mysql> create table DemoTable    -> (    -> FirstName varchar(30),    -> LastName varchar(30)    -> ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 'Brown'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Adam', 'Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Carol', 'Taylor'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;OutputThis will produce the following ... Read More

Add a New Column and Set Values in MySQL Based on Conditions

karthikeya Boyini
Updated on 30-Jun-2020 11:29:33

3K+ Views

To set values on the basis of conditions, use IF() method. Let us first create a table −mysql> create table DemoTable    -> (    -> Age int    -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(19); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(16); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(17); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(22); Query OK, 1 row affected (0.19 sec)Display all records from ... Read More

Order By Timestamp in MySQL

karthikeya Boyini
Updated on 30-Jun-2020 11:28:26

1K+ Views

To order by timestamp, use the ORDER BY as in the following syntax −select *from yourTableName ORDER BY STR_TO_DATE(`yourColumnName`, '%m/%d/%Y%h:%i:%s %p');Let us first create a table −mysql> create table DemoTable    -> (    -> `timestamp` varchar(100)    -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('06/22/2019 01:10:20 PM'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('06/22/2019 12:00:27 PM'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('06/22/2019 06:56:20 AM'); Query OK, 1 row affected (0.23 sec) ... Read More

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