MySQL Articles - Page 86 of 439

Let us first create a table −mysql> create table DemoTable1453    -> (    -> CustomerId int,    -> CustomerReviewNumber int    -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1453 values(10, 4); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1453 values(10, 4); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable1453 values(11, 5); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1453 values(11, 5); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable1453 values(11, 5); Query OK, 1 ... Read More

Let us first create a table −mysql> create table DemoTable1452    -> (    -> FavouriteColor varchar(50)    -> ); Query OK, 0 rows affected (2.42 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1452 values('Red'); Query OK, 1 row affected (0.31 sec) mysql> insert into DemoTable1452 values('Yellow'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1452 values('Yellow'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1452 values('Yellow'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1452 values('Blue'); Query OK, 1 row affected (0.42 sec) mysql> insert into DemoTable1452 values('Blue'); ... Read More

Let us first create a table −mysql> create table DemoTable1451    -> (    -> JoiningDate date    -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1451 values('2019-07-21'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable1451 values('2018-01-31'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1451 values('2017-06-01'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select * from DemoTable1451;This will produce the following output −+-------------+ | JoiningDate | +-------------+ | 2019-07-21  | | 2018-01-31  | ... Read More

Let’s say we are finding records matching with the current date. Since we want repeated matching records only once, use LIMIT.For example, the current date is −2019-10-02Let us first create a table −mysql> create table DemoTable1450    -> (    -> DueDate date    -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1450 values('2019-09-30'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1450 values('2019-10-02'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1450 values('2019-10-02'); Query OK, 1 row affected (0.10 sec) mysql> insert into ... Read More

Let us first create a table −mysql> create table DemoTable1449    -> (    -> PlayerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> PlayerScore int    -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1449(PlayerScore) values(1040); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1449(PlayerScore) values(1450); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable1449(PlayerScore) values(1890); Query OK, 1 row affected (0.72 sec) mysql> insert into DemoTable1449(PlayerScore) values(1650); Query OK, 1 row affected (0.25 sec)Display all records from the table using select statement ... Read More

Let us first create a table −mysql> create table DemoTable1448    -> (    -> StartDate date,    -> EndDate date    -> ); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1448 values('2019-01-21', '2019-03-22'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1448 values('2019-04-05', '2019-10-10'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1448 values('2019-10-01', '2019-10-29'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1448 values('2018-12-31', '2019-12-31'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> ... Read More

For this, you can use REGEXP in MySQL. Let’s say you want the row records wherein any of the comma separated value is 90. For this, use regular expression.Let us first create a table −mysql> create table DemoTable1447    -> (    -> Value varchar(100)    -> ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1447 values('19, 58, 90, 56'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1447 values('56, 89, 99, 100'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1447 values('75, 76, 65, ... Read More

To find the difference, use the DATEDIFF() method. Let us first create a table −mysql> create table DemoTable1446    -> (    -> DueDate date    -> ); Query OK, 0 rows affected (1.42 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1446 values('2019-01-21'); Query OK, 1 row affected (0.69 sec) mysql> insert into DemoTable1446 values('2019-02-01'); Query OK, 1 row affected (0.44 sec) mysql> insert into DemoTable1446 values('2019-09-30'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select * from DemoTable1446;This will produce the following output −+------------+ | DueDate ... Read More

To set conditions in a stored procedure, use IF...ELSE in MySQL. Following is the syntax for if-else −IF yourCondition then       yourStatement1,  ELSE           yourStatement2,  END IF;Let us implement the above syntax in a stored procedure −mysql> DELIMITER // mysql> CREATE PROCEDURE IF_ELSE_DEMO(IN value int)    -> BEGIN    ->    SET @val=value;    ->    IF @val > 10 then    ->       select concat(@val, ' is greater than 10');    ->    ELSE    ->        select concat(@val, ' is less than 10 ');    ->    END ... Read More

To get string as date, use STR_TO_DATE() method. Let us first create a table −mysql> create table DemoTable1445    -> (    -> AdmissionDate varchar(20)    -> ); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1445 values('01.10.2019'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1445 values('31.12.2018'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1445 values('01.02.2017'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select −mysql> select * from DemoTable1445;This will produce the following output −+---------------+ | AdmissionDate | ... Read More