AmitDiwan has Published 11367 Articles

MySQL query to order by NULL values

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 12:10:19

139 Views

Let us first create a table −mysql> create table DemoTable707 (    StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    StudentFirstName varchar(100),    StudentMarks int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable707(StudentFirstName, StudentMarks) values('John', 45); Query OK, ... Read More

MySQL query to get the current date records wherein one of the columns displays current date

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 12:07:06

171 Views

To achieve this, following is the syntax wherein we have used DATE(NOW()) −select *from yourTableName where DATE(yourColumnName)=DATE(NOW());Let us first create a table −mysql> create table DemoTable706 (    UserId varchar(100),    UserName varchar(100),    UserSignupDate datetime ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using ... Read More

MySQL query to retrieve current date from a list of dates

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 12:05:32

201 Views

Let’s say the current date is −2019-07-22Let us first create a table −mysql> create table DemoTable705 (ShippingDate datetime); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable705 values('2019-01-21 23:59:00'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable705 ... Read More

Get count of how many times a string appears in a MySQL column?

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 12:04:15

281 Views

Let us first create a table −mysql> create table DemoTable704 (SubjectName text); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable704 values('Introduction to MySQL'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable704 values('Introduction to MongoDB'); Query OK, ... Read More

Return 0 in a new column when record is NULL in MySQL?

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 12:03:03

170 Views

For this, you can use CASE statement. Let us first create a table −mysql> create table DemoTable703 (Price int); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command −mysql> insert into DemoTable703 values(102); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable703 ... Read More

Error occurs when table name “references” is set while creating a table

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 11:59:28

87 Views

You cannot give table name references because it is a reserved keyword. Wrap it using backticks, for example, `references`.Let us first create a table −mysql> create table `references`(Subject text); Query OK, 0 rows affected (0.44 sec)Insert some records in the table using insert command −mysql> insert into `references` values('Introduction To ... Read More

Update only the int in MySQL Field

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 11:58:23

63 Views

Let us first create a table −mysql> create table DemoTable702 (    StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    StudentName varchar(100),    StudentScore int ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable702(StudentName, StudentScore) values('Chris', 56); Query OK, ... Read More

Update the date and time values while inserting them in MySQL

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 11:55:41

111 Views

Here, we will see an example wherein we are inserting datetime and updating them while using INSERT query.Let us first create a table −mysql> create table DemoTable816 (DueDate datetime); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command. Here is the query to add ... Read More

Copy from one column to another (different tables same database) in MySQL?

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 11:49:55

5K+ Views

To copy from one column to another, you can use INSERT INTO SELECT statement.Let us first create a table −mysql> create table DemoTable1 (PlayerScore int); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(98); Query OK, 1 row affected ... Read More

MySQL query to set my auto increment column ( id ) to zero or reset the value of auto increment field?

AmitDiwan

AmitDiwan

Updated on 21-Aug-2019 11:48:17

2K+ Views

Use ALTER table to set the auto_increment column to 0 or reset with another valueALTER TABLE yourTableName AUTO_INCREMENT=0;The above syntax will begin from 1.Let us first create a table −mysql> create table DemoTable698 (    ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY ) auto_increment=109; Query OK, 0 rows affected (0.88 ... Read More

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