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Database Articles
Page 357 of 547
Count(*) rows from multiple tables in MySQL?
To count rows from multiple tables in MySQL, the syntax is as follows −Select (select count(*) from yourTableName1) as anyAliasName1, (select count(*) from yourTableName2) as anyAliasName2 from dual;Let us first create a table −mysql> create table DemoTable1 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(), (), (), (), (), (); Query OK, 6 rows affected (0.24 sec) Records: 6 Duplicates: 0 Warnings: 0Display all records from the ...
Read MoreOrder a column in MySQL with IP Address records?
For this, use INET_ATON() in MySQL. The INET_ATON() method would allow a user to convert IP Address records to a number and then we can use ORDER BY to order them.Let us first create a table −mysql> create table DemoTable -> ( -> IpAddress varchar(50) -> ); Query OK, 0 rows affected (1.36 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('192.168.110.78'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('192.168.110.87'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('192.168.110.75'); Query OK, 1 row affected (0.26 ...
Read MoreMySQL equivalent to Sybase ASE command?
The MySQL equivalent to sybase ASE command is EXPLAIN keyword. Let us first create a table −mysql> create table DemoTable1531 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) -> ); Query OK, 0 rows affected (2.92 sec) mysql> create index Name_index1 on DemoTable1531(StudentName); Query OK, 0 rows affected (0.99 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert command −mysql> insert into DemoTable1531(StudentName) values('Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1531(StudentName) values('Robert'); Query OK, 1 row affected (0.10 sec) mysql> insert into ...
Read MoreMySQL query to select maximum and minimum salary row?
For this, use sub query along with MIN() and MAX(). To display both the maximum and minimum value, use UNION ALL. Let us first create a table −mysql> create table DemoTable -> ( -> EmployeeName varchar(20), -> EmployeeSalary int -> ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Bob', 8800); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Chris', 9800); Query OK, 1 row affected (0.63 sec) mysql> insert into DemoTable values('David', 7600); Query OK, 1 row affected (0.11 sec) mysql> ...
Read MoreFinding the average and display the maximum average of duplicate ids?
For this, use AVG(). To find the maximum average value, use MAX() and group by id. Let us first create a table −mysql> create table DemoTable -> ( -> PlayerId int, -> PlayerScore int -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1, 78); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(2, 82); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(1, 45); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(3, 97); ...
Read MoreUsing GROUP BY and COUNT in a single MySQL query to group duplicate records and display corresponding max value
Let us first create a table −mysql> create table DemoTable -> ( -> ClientId int, -> Value int -> ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 678); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(20, 678); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(30, 678); Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----------+-------+ | ClientId | Value ...
Read MoreFetching multiple MySQL rows based on a specific input within one of the table columns?
Let us first create a table −mysql> create table DemoTable1528 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentSubject varchar(20) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1528(StudentName, StudentSubject) values('Chris', 'MongoDB'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable1528(StudentName, StudentSubject) values('Bob', 'MySQL'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1528(StudentName, StudentSubject) values('David', 'Java'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1528(StudentName, StudentSubject) values('Carol', 'C'); Query OK, 1 ...
Read MoreHow to insert records with double quotes in MySQL?
To insert records with double quotes, use the backslash (\) as in the below syntax −Syntaxinsert into yourTableName values('"yourValue"');Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('"John"'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('"Chris"'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('"Adam Smith"'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('"Carol"'); Query OK, 1 row affected ...
Read MoreHow to display only hour and minutes in MySQL?
To display only hour and minutes, use DATE_FORMAT() and set format specifiers as in the below syntax −select date_format(yourColumnName, '%H:%i') as anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable1527 -> ( -> ArrivalDatetime datetime -> ); Query OK, 0 rows affected (0.76 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1527 values('2019-01-10 12:34:45'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1527 values('2018-12-12 11:00:34'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1527 values('2019-03-21 04:55:56'); Query OK, 1 row affected (0.18 sec)Display all records from ...
Read MoreOrder by last 3 months first, then alphabetically in MySQL?
Let us first create a table −mysql> create table DemoTable1526 -> ( -> CustomerName varchar(20), -> PurchaseDate date -> ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command. Here, we have inserted 2019 dates −mysql> insert into DemoTable1526 values('Adam', '2019-06-01'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1526 values('Sam', '2019-04-26'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1526 values('Chris', '2019-05-24'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1526 values('David', '2019-10-10'); Query OK, 1 row affected (0.23 sec) mysql> insert into ...
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