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MySQL Articles
Page 209 of 355
Fetch random rows from a table with MySQL
For this, you can use a PREPARE statement. Let us first create a table −mysql> create table DemoTable( FirstName varchar(100), CountryName varchar(100) ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Adam', 'US'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Chris', 'AUS'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Robert', 'UK'); Query OK, 1 row affected (0.32 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-----------+-------------+ | FirstName | ...
Read MoreCheck if a given year is leap year in PL/SQL
Here we will see how to check given year is leap year or not, using PL/SQL. In PL/SQL code, some group of commands are arranged within a block of related declaration of statements.The leap year checking algorithm is like below.AlgorithmisLeapYear(year): begin if year is divisible by 4 and not divisible by 100, then it is leap year else if the number is divisible by 400, then it is leap year else it is not leap year endExampleDECLARE year NUMBER := 2012; BEGIN IF MOD(year, 4)=0 ...
Read MoreHow to find repeated rows and display there count in a separate column with MySQL?
For this, use the GROUP BY HAVING clause. Let us first create a table −mysql> create table DemoTable( Name varchar(100), Age int ); Query OK, 0 rows affected (1.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 23); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('David', 21); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Chris', 23); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Chris', 21); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values('Mike', 25); Query OK, ...
Read MoreSelect with set order in MySQL
For this, you need to use IN() and after that FIELD() method. Let us first create a table −mysql> create table DemoTable( StudentId varchar(10), StudentName varchar(20) ) ; Query OK, 0 rows affected (4.11 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10001', 'Adam'); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable values('1010', 'Chris'); Query OK, 1 row affected (0.72 sec) mysql> insert into DemoTable values('1020', 'Bob'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable values('1030', 'Carol'); Query OK, 1 row affected (0.47 sec) mysql> insert into ...
Read MoreHow to search a column for an exact string in MySQL?
For exact string, you need to use wildcard ‘%’ with LIKE operator −select *from yourTableName where binary yourColumnName LIKE '%yourStringValue%';Let us first create a table −mysql> create table DemoTable( Name varchar(20) ); Query OK, 0 rows affected (1.93 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (1.11 sec) mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (1.19 sec) mysql> insert into DemoTable values('JOHN'); Query OK, 1 row affected (0.60 sec) mysql> insert into DemoTable ...
Read MoreCount zero, NULL and distinct values except zero and NULL with a single MySQL query
Let us first create a table −mysql> create table DemoTable( Value int ); Query OK, 0 rows affected (1.35 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values(NULL); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.59 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.70 ...
Read MoreIs SELECT * faster than 40 columns listing in MySQL?
The SELECT * is slower than 40 columns listing. It’s a better choice to list the column names while using the SELECT query. Let us see a simple example and create a table −mysql> create table DemoTable( Id int, Name varchar(20), Age int, ZipCode varchar(20), CountryName varchar(20) ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, 'Chris', 23, '0909332', 'US'); Query OK, 1 row affected (0.48 sec) mysql> insert into DemoTable values(102, 'Bob', 24, '8747443', 'AUS'); Query OK, 1 row affected (0.50 sec) ...
Read MoreGet second largest marks from a MySQL table using subquery?
Let us first create a table −mysql> create table DemoTable( Marks int ); Query OK, 0 rows affected (1.34 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(78); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(88); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(67); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(76); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(98); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(86); Query OK, 1 row affected (0.11 ...
Read MoreMySQL query to count number of duplicate values in a table column
Let us first create a table −mysql> create table DemoTable( Data int ); Query OK, 0 rows affected (0.98 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(60); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(50); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(60); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(40); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.15 ...
Read MoreA single MySQL query to select value from first table and insert in the second?
Let us first create a table −mysql> create table DemoTable1( Value int ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(67); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1 values(46); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;This will produce the following output −+-------+ | Value | +-------+ | 67 | | 46 | +-------+ 2 rows in set (0.00 sec)Following is the query to create the ...
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