Database Articles - Page 211 of 671

For this, use RLIKE and filter records as in the below syntax &Minus;select * from yourTableName    where yourColumnName rlike 'yourValue1|yourValue2';Let us first create a table −mysql> create table DemoTable1935    (    Subject varchar(20)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1935 values('MySQL'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1935 values('Python'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1935 values('MongoDB'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1935 values('SQL Server'); Query OK, 1 row affected (0.00 ... Read More

For getting average, use AVG() and use it with DISTINCT to calculate from distinct records. Let us first create a table −mysql> create table DemoTable1934    (    StudentName varchar(20),    StudentMarks int    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1934 values('Chris', 56); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1934 values('Chris', 56); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1934 values('David', 78); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1934 values('David', 78); Query OK, 1 row affected ... Read More

Let us first create a table −mysql> create table DemoTable1933    (    ClientName varchar(20)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1933 values('Chris Brown'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1933 values('David Miller'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1933 values('Adam Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1933 values('John Doe'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1933;This will produce the ... Read More

Use ORDER BY to fix a record and then displayselect * from yourTableName order by yourColumnName1=yourValue desc, yourColumnName2;Let us first create a table −mysql> create table DemoTable1932    (    UserName varchar(20),    ShippingDate date    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1932 values('Chris', '2018-10-12'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1932 values('David', '2019-04-11'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1932 values('Mike', '2016-12-04'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1932 values('Carol', '2017-12-26'); Query OK, 1 ... Read More

For month and year in a specific format, use DATE_FORMAT() along with STR_TO_DATE(). Let us first create a table −mysql> create table DemoTable1931    (    ShippingDate varchar(40)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1931 values('10-11-2017'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1931 values('31-01-2019'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1931 values('02-02-2018'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1931 values('10-06-2013'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select ... Read More

For this, you can use date_add(). Let us first create a table −mysql> create table DemoTable1930    (    DueTime datetime    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1930 values('2017-10-21'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2019-12-14'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2018-11-26'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1930 values('2014-06-16'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1930;This will ... Read More

To reset primary key, at first use TRUNCATE table, then use ALTER TABLE. Let us first create a table −mysql> create table DemoTable1929    (    UserId int NOT NULL AUTO_INCREMENT,    PRIMARY KEY(UserId)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1929 values(); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1929;This ... Read More

To insert in a table in stored procedure, the syntax is as follows −create procedure yourProcedureName(OptionalParameter)    begin    insert into yourTableName() values(yourValue1, yourValue2, ...N); endTo understand the above syntax, let us first create a table −mysql> create table DemoTable1928    (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Name varchar(20),    Age int    ); Query OK, 0 rows affected (0.00 sec)Here is the query to create a stored procedure −mysql> delimiter // mysql> create procedure insert_demo(IN Name varchar(40), IN Age int)    begin    insert into DemoTable1928(Name, Age) values(Name, Age);    end    // Query OK, ... Read More

The coalesce() can be used to print first NOT NULL column value. Let us first create a table −mysql> create table DemoTable1927    (    StudentName varchar(20),    StudentSubject varchar(20)    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1927 values('Chris', 'MySQL'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1927 values('David', NULL); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1927 values(NULL, 'MongoDB'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1927;This will ... Read More

For this, you can use ORDER BY CASE statement. Let us create a table −mysql> create table DemoTable1926    (    Position varchar(20),    Number int    ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1926 values('Highest', 50); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Highest', 30); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Lowest', 100); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Lowest', 120); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1926 values('Lowest', ... Read More