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Articles by AmitDiwan
Page 748 of 840
Implement Custom Sort Order in MySQL
To implement custom sort order in MySQL, you need to use ORDER BY FIELD(). Let us first create a table −mysql> create table DemoTable -> ( -> Designation varchar(100) -> ); Query OK, 0 rows affected (1.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Software Engineer'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Associate Software Engineer'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('Software Development Engineer'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Product Manager'); Query OK, 1 row ...
Read MoreCan we select field name in MySQL that contains an asterisk?
No, we cannot. To still work it out, use backticks around the field name. Let us first create a table with column name with asterisk, `Name*` −mysql> create table DemoTable -> ( -> `Name*` varchar(20) -> ); Query OK, 0 rows affected (2.03 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(`Name*`) values('Chris Brown'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(`Name*`) values('David Miller'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(`Name*`) values('John Doe'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(`Name*`) values('John Smith'); ...
Read MoreMySQL query to search a string 'demo' if someone mistakenly types 'deom'?
For this, you can use SOUND along with the LIKE operator. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.95 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable values('Johm'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('Carol'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('SAMSUNG'); Query ...
Read MoreHow to replace 'Empty set' in a MySQL query?
To replace a record that doesn’t exist, use the COALESCE in MySQL. The COALESCE would help in substituting the NULL values. Let us first create a table −mysql> create table DemoTable -> ( -> Code varchar(20) -> ); Query OK, 0 rows affected (1.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('45'); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values('78'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement ...
Read MoreOrder by a single field and display rest of the records in the same order with MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(201, 'Chris Brown'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(110, 'John Doe'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values(101, 'Adam Smith'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(345, 'Carol Taylor'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(135, ...
Read MoreFind "greatest" between two columns and display with some records already null in MySql
Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(78, 89); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(19, null); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(null, 0); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(null, 95); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> ...
Read MoreOrder records and delete n rows in MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstName varchar(20) -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(FirstName) values('John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(FirstName) values('David'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 ...
Read MoreAdd a single day to datetime field with MySQL INTERVAL
Let us first create a table −mysql> create table DemoTable -> ( -> DueDate date ->); Query OK, 0 rows affected (2.11 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-21'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('2018-12-31'); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable values('2018-12-30'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values('2017-02-26'); Query OK, 1 row affected (0.47 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------------+ ...
Read MoreShifting values of rows in MySQL to change the existing id values for existing rows?
Let us first create a table −mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) -> ); Query OK, 0 rows affected (1.07 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentName) values('Chris'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(StudentName) values('Robert'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(StudentName) values('David'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(StudentName) values('Mike'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement ...
Read MoreMySQL query to delete last two words from every column value
For this, you can use the LEFT() function from MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> Name varchar(10) -> ); Query OK, 0 rows affected (0.71 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 (0.07 sec) mysql> insert into DemoTable values('Robert'); 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 following output −+--------+ | ...
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