AmitDiwan

AmitDiwan

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Articles by AmitDiwan

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Delete last value and fix two new values (VARCHAR Numbers) in MySQL declared as VARCHAR?

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 155 Views

Let us first create a table. Here, we have VARCHAR type for value −mysql> create table DemoTable (    Value varchar(100) ); Query OK, 0 rows affected (1.80 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('100'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('1244'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('15789'); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-------+ | Value | +-------+ | 100 | ...

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MySQL query to fetch date records greater than the current date after adding days with INTERVAL?

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 669 Views

Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    AddDay int,    PostDate date ); Query OK, 0 rows affected (2.73 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(AddDay, PostDate) values(20, '2019-08-04'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(AddDay, PostDate) values(7, '2019-08-20'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(AddDay, PostDate) values(45, '2019-07-01'); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output ...

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Add a new column to table and fill it with the data of two other columns of the same table in MySQL?

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 1K+ Views

Let us first create a table −mysql> create table DemoTable (    Price int,    Quantity int ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(45, 3); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(90, 2); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(440, 1); 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 −+-------+----------+ | Price | Quantity | +-------+----------+ | ...

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Create a temporary table similar to a regular table with MySQL LIKE

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 228 Views

Let us first create a table −mysql> create table DemoTable1 (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Name varchar(100) ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1(Name) values('Chris'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1(Name) values('Robert'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1(Name) values('Mike'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1(Name) values('Sam'); Query OK, 1 row affected (0.07 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;This will produce ...

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Display record with today and tomorrow's date from a column with date record in MySQL

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 631 Views

Let us first create a table −mysql> create table DemoTable (    AdmissionDate date ); Query OK, 0 rows affected (0.87 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-08-24'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('2019-08-25'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('2019-08-20'); Query OK, 1 row affected (0.24 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+---------------+ | AdmissionDate | +---------------+ | 2019-08-24 | | 2019-08-25 | ...

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How do I sort numbers saved as VARCHAR in MySQL with some of them having preceding 0 like 085, 090, etc.?

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 94 Views

Following is the syntax −select *from yourTableName order by yourColumnName*1, yourColumnName;Let us first create a table −mysql> create table DemoTable (    Value varchar(100) ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('90'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('86'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('45'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('85'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('085'); Query OK, 1 row affected (0.14 sec) ...

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Converting boolean values to positive or negative sign in MySQL?

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 412 Views

Following is the syntax −select if(yourColumnName, 1, -1) from yourTableName;Let us first create a table −mysql> create table DemoTable (    isMarried boolean ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(true); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(false); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(false); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(true); Query OK, 1 row affected (0.36 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will ...

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Set a custom value for NULL or empty values in MySQL

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 844 Views

Let us first create a table −mysql> create table DemoTable (    Value varchar(100) ); Query OK, 0 rows affected (0.75 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('100'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(''); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('200'); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable values(null); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+-------+ | Value | +-------+ ...

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Find the number of logins between two dates in MySQL

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 245 Views

Use BETWEEN to find the logins between two dates. Let us first create a table −mysql> create table DemoTable (    Login datetime ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-08-10'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('2019-08-12'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-08-20'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('2019-08-24'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will ...

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Display multiple selected rows using MySQL IN()

AmitDiwan
AmitDiwan
Updated on 30-Sep-2019 617 Views

Let us first create a table −mysql> create table DemoTable1045 (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    FirstName varchar(100) )AUTO_INCREMENT=100; Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1045(FirstName) values('John'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1045(FirstName) values('Chris'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable1045(FirstName) values('Robert'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1045(FirstName) values('Mike'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1045(FirstName) values('Adam'); Query OK, 1 row affected (0.08 sec)Display all records ...

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