Yes, you can use false as 0 to match.Let us first create a table −mysql> create table DemoTable804 ( Id varchar(100) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command −mysql> insert into DemoTable804 values('101John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable804 values('Carol1002'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable804 values('1000'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable804 values('1010Bob'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select *from DemoTable804;This ... Read More

To set default values for columns while creating a table, DEFAULT. Let us first see an example and create a table. As you can see below, while creating the table, we have set DEFAULT −mysql> create table DemoTable803 ( UserId int DEFAULT 101, UserName varchar(100) DEFAULT 'Chris' ); Query OK, 0 rows affected (1.18 sec)Insert some records in the table using insert command. For the values we are not inserting, the default values will get set automatically −mysql> insert into DemoTable803 values(102, 'Chris'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable803(UserName) ... Read More

Use CONCAT() to concatenate records whereas IFNULL() to check for NULL values.Let us first create a table −mysql> create table DemoTable802 ( FirstName varchar(100), LastName varchar(100) ); Query OK, 0 rows affected (1.01 sec)Insert some records in the table using insert command −mysql> insert into DemoTable802 values('Adam', 'Smith'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable802 values('Carol', NULL); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable802 values(NULL, 'Taylor'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable802 values(NULL, NULL); Query OK, 1 row affected (0.21 sec)Display ... Read More

For this, use ORDER BY IF().Let us first create a table −mysql> create table DemoTable801 ( Score int ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable801 values(30); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable801 values(99); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable801 values(45); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable801 values(55); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable801 values(99); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable801 values(69); ... Read More

Let us first create a table −mysql> create table DemoTable800 ( Value int ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command. Here, we have inserted 5 similar values −mysql> insert into DemoTable800 values(10); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable800 values(10); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable800 values(10); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable800 values(10); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable800 values(10); Query OK, 1 row affected (0.10 sec)Display all ... Read More

The CONCAT() method is used to concat, whereas GROUP_CONCAT() is used to concatenate strings from a group in a single string.Let us first create a table −mysql> create table DemoTable799 ( UserId int, UserName varchar(100), UserAge int ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable799 values(101, 'John', 21); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable799 values(102, 'Chris', 26); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable799 values(101, 'Robert', 23); Query OK, 1 ... Read More

Let’s see when the #1054 error occurs in MySQL. While inserting a varchar value, if you will forget to add single quotes, then this error will arise. Following is the error −mysql> insert into DemoTable798 values(100, Adam); ERROR 1054 (42S22): Unknown column 'Adam' in 'field list'You need to use single quotes around the string value to fix this error as shown below −mysql> insert into DemoTable798 values(100, ’Adam’);Let us first create a table −mysql> create table DemoTable798 ( StudentId int, StudentName varchar(100) ); Query OK, 0 rows affected (0.51 sec)Insert some records in the ... Read More

The correct datetime format for MySQL database is as follows −‘YYYY-MM-DD HH:M:SS’Let us first create a table −mysql> create table DemoTable797 ( ArrivalDatetime datetime ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable797 values(NOW()); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable797 values('2016-12-21 12:50:34'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable797 values('2017-03-01 17:40:21'); Query OK, 1 row affected (0.24 sec)Display all records from the table using select statement −mysql> select *from DemoTable797;This will produce the following output. We have ... Read More

Use the DAYNAME() to display the day name from records with Date of Birth.Let us first create a table −mysql> create table DemoTable795 ( DateOfBirth date ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable795 values('1996-01-21'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable795 values('2004-11-01'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable795 values('1990-03-31'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable795 values('2010-12-03'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select ... Read More

To display number of fields in MySQL, use the COUNT(*). Following is the syntax −select COUNT(*) AS anyAliasName from INFORMATION_SCHEMA.COLUMNS where table_name = yourTableName AND TABLE_SCHEMA = yourDatabaseName;Let us first create a table −mysql> create table DemoTable794 ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(100), ClientAge int, ClientCountryName varchar(100) ); Query OK, 0 rows affected (1.61 sec)Following is the query to get the number of fields in MySQL −mysql> select COUNT(*) AS TOTAL_NUMBER_OF_COLUMNS from INFORMATION_SCHEMA.COLUMNS where table_name = 'DemoTable794' AND ... Read More