Sort MySQL Column Values Ignoring Quotes

AmitDiwan
Updated on 09-Sep-2019 08:16:48

218 Views

To ignore quotes while ordering column values, use ORDER BY TRIM().Let us first create a table −mysql> create table DemoTable784 ( Message varchar(100) ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable784 values('Good'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable784 values('\"This is not a Message\"'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable784 values('Bye'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable784 values('Hello'); Query OK, 1 row affected (0.15 sec)Display all records from the table using ... Read More

What are Raw Types in Generics in Java

Maruthi Krishna
Updated on 09-Sep-2019 08:15:30

554 Views

Generics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the reference type that a method, constructor of a class accepts, dynamically. By defining a class as generic you are making it type-safe i.e. it can act up on any datatype.To define a generic class you need to specify the type parameter you are using in the angle brackets “” after the class name and you can treat this as datatype of the instance variable an ... Read More

Count and Sort Rows with a Single MySQL Query

AmitDiwan
Updated on 09-Sep-2019 08:14:30

212 Views

Let us first create a table −mysql> create table DemoTable783 ( FirstName varchar(100) ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable783 values('Adam'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable783 values('Chris'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable783 values('Chris'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable783 values('Adam'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable783 values('Adam'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable783 values('Robert'); Query OK, 1 ... Read More

MySQL Query to Group By Column and Sum Similar Values

AmitDiwan
Updated on 09-Sep-2019 08:12:49

514 Views

For this, use GROUP BY HAVING clause.Let us first create a table −mysql> create table DemoTable782 ( Name varchar(100), Score int ); Query OK, 0 rows affected (1.18 sec)Insert some records in the table using insert command −mysql> insert into DemoTable782 values('John', 156); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable782 values('Carol', 250); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable782 values('Bob', 140); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable782 values('John', 126); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable782 values('John', ... Read More

Count Empty or Null Columns in a MySQL Table

AmitDiwan
Updated on 09-Sep-2019 08:10:53

1K+ Views

Let us first create a table −mysql> create table DemoTable781 ( Name varchar(100) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable781 values(''); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable781 values('Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable781 values(''); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable781 values(null); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable781 values(null); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable781 values(''); Query OK, 1 ... Read More

Display Column Names from a Table Excluding Some in MySQL

AmitDiwan
Updated on 09-Sep-2019 08:09:06

370 Views

To exclude some of the column names, use NOT IN.Let us first create a table −mysql> create table DemoTable780 (    CustomerId int,    CustomerName varchar(100),    CustomerAge int, CustomerCountryName varchar(100), isMarried tinyint(1) ); Query OK, 0 rows affected (0.47 sec)Here is the query to exclude result −mysql> select group_concat(column_name) from `information_schema`.`COLUMNS` m where table_schema = 'web' and table_name = 'DemoTable780' and column_name not in ('CustomerId','CustomerCountryName') group by table_schema,table_name;This will produce the following output -+------------------------------------+ | group_concat(column_name) | +------------------------------------+ | CustomerName,CustomerAge,isMarried | +------------------------------------+ 1 row in set (0.01 sec)

Increment Column Value Using MySQL SET Clause

AmitDiwan
Updated on 09-Sep-2019 08:06:27

212 Views

Since the column value ‘ADD’ is already a reserved word, therefore you need to use backticks around the word ADD like `ADD`.Let us see an example and create a table −mysql> create table DemoTable779 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, `ADD` int ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable779(`ADD`) values(54); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable779(`ADD`) values(89); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable779(`ADD`) values(66); Query OK, 1 row affected ... Read More

Multiple Type Parameters in Generic Methods in Java

Maruthi Krishna
Updated on 09-Sep-2019 08:05:18

10K+ Views

Generics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the reference type that a method, constructor of a class accepts, dynamically. By defining a class as generic you are making it type-safe i.e. it can act up on any datatype.To define a generic class you need to specify the type parameter you are using in the angle brackets “” after the class name and you can treat this as datatype of the instance variable an ... Read More

Select Rows from a MySQL Table Using IN

AmitDiwan
Updated on 09-Sep-2019 08:04:43

246 Views

Let us first create a table −mysql> create table DemoTable778 ( ClientId varchar(100), ClientName varchar(100) ); Query OK, 0 rows affected (1.05 sec)Insert some records in the table using insert command −mysql> insert into DemoTable778 values('J-101', 'John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable778 values('A-102', 'Adam'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable778 values('C-103', 'Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable778 values('D-104', 'David'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable778 values('R-105', 'Robert'); Query OK, 1 row affected ... Read More

MySQL Query to Display Column and Values Using OR in WHERE Statement

AmitDiwan
Updated on 09-Sep-2019 08:02:13

89 Views

Let us first create a table −mysql> create table DemoTable777 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100), StudentAge int ); Query OK, 0 rows affected (1.34 sec)Insert some records in the table using insert command −mysql> insert into DemoTable777(StudentName, StudentAge) values('Chris', 23); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable777(StudentName, StudentAge) values('Robert', 21); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable777(StudentName, StudentAge) values('Mike', 19); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable777(StudentName, StudentAge) values('Bob', 22); Query OK, 1 row ... Read More

Advertisements