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Database Articles
Page 403 of 547
MySQL query to order by the first number in a set of numbers?
To order by the first number in a set of numbers, use ORDER BY SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable ( SetOfNumbers text ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('245, 654, 76, 89, 98'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('2000, 567, 9090, 6789'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('1001, 90595, 657, 99'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> ...
Read MoreCan we use reserved word 'index' as MySQL column name?
Yes, but you need to add a backtick symbol to the reserved word (index) to avoid error while using it as a column name.Let us first create a table −mysql> create table DemoTable ( `index` int ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(1000); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(1020); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(967); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(567); Query OK, 1 row affected (0.12 ...
Read MoreGetting maximum from a column value and set it for all other values in the same column with MySQL?
Let us first create a table −mysql> create table DemoTable ( FirstName varchar(100), Score int ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('David', 59); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('Chris', 97); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values('Bob', 98); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Carol', 91); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the ...
Read MoreCompare for NULL value and display value 1 for these values in a new MySQL column?
For this, use IF() along with IS NULL property. Let us first create a table −mysql> create table DemoTable ( Name varchar(100), CountryName varchar(100) ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 'US'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Mike', NULL); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(Name) values('David'); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable values('Bob', 'AUS'); Query OK, 1 row affected (0.45 sec)Display all records from the table using select ...
Read MoreHow to find specific row with a MySQL query?
Let us first create a table −mysql> create table DemoTable ( UserId int, UserName varchar(100) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(101, 'Bob'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable values(102, 'David'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(103, 'Mike'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(104, 'Sam'); Query OK, 1 row affected (0.16 sec)Display all records ...
Read MoreMySQL query to display the count of distinct records from a column with duplicate records
Let us first create a table −mysql> create table DemoTable ( StudentId int, StudentFirstName varchar(100) ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'John'); Query OK, 1 row affected (0.32 sec) mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(102, 'John'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(103, 'Sam'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(104, 'Sam'); Query OK, 1 row affected (0.13 sec)Display all records ...
Read MoreMore elegant way to insert empty java.sql.Date in MySQL Database?
Let us first create a table. Following is the query to create a table in database ‘web’ −mysql> create table DemoTable ( AdmissionDate date ); Query OK, 0 rows affected (0.53 sec)Here is the Java code to insert empty(NULL) java.sql.Date in MySQL DB −import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; public class InsertNullDateDemo{ public static void main(String[] args){ Connection con=null; PreparedStatement ps=null; try{ con=DriverManager.getConnection("jdbc:mysql://localhost:3306/web?useSSL=false", "root", "123456"); String query="insert into DemoTable(AdmissionDate) values(?) "; ps= con.prepareStatement(query); ...
Read MoreRemove trailing numbers surrounded by parenthesis from a MySQL column
For this, use trim() along with substring(). Let us first create a table −mysql> create table DemoTable ( Name varchar(100) ); Query OK, 0 rows affected (0.80 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('1stJohn'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('1stJohn (7)'); Query OK, 1 row affected (0.65 sec) mysql> insert into DemoTable values('2ndSam'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2ndSam (4)'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will ...
Read MoreMySQL query to group concat distinct by Id?
Let us first create a table −mysql> create table DemoTable ( Id int, Name varchar(100) ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.44 sec) mysql> insert into DemoTable values(200, 'Robert'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(100, 'Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(300, 'David'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(400, 'Mike'); Query OK, 1 row affected (0.10 sec) mysql> insert ...
Read MoreMySQL query to replace backslash from a varchar column with preceding backslash string values
Let us first create a table −mysql> create table DemoTable ( Title varchar(100) ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('"MySQL'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('MongoDB"'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('"Java"'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('"C"'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-----------+ | Title ...
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