To compare two strings, which are numbers, let us first create a table. Following is the query −mysql> create table compareTwoStringsDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> Value varchar(100)    -> ); Query OK, 0 rows affected (0.52 sec)Following is the query to insert some records in the table using insert command −mysql> insert into compareTwoStringsDemo(Value) values('1235667'); Query OK, 1 row affected (0.66 sec) mysql> insert into compareTwoStringsDemo(Value) values('999999'); Query OK, 1 row affected (0.11 sec) mysql> insert into compareTwoStringsDemo(Value) values('999888'); Query OK, 1 row affected (0.17 sec) mysql> ... Read More

Use the CURRENT_TIMESTAMP instead of current_date() in MySQL for timestamp default current_date. Let us first create a table. Following is the query −mysql> create table defaultCurrent_DateDemo    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(20),    -> StudentAdmissionDate timestamp default CURRENT_TIMESTAMP    -> ); Query OK, 0 rows affected (0.55 sec)Following is the query to insert some records in the table using insert command −mysql> insert into defaultCurrent_DateDemo(StudentName) values('Larry'); Query OK, 1 row affected (0.52 sec) mysql> insert into defaultCurrent_DateDemo(StudentName, StudentAdmissionDate) values('Chris', '2019-01-31'); Query OK, 1 row affected (0.18 sec)Following is the ... Read More

To view the auto_increment value for a table, you can use INFORMATION_SCHEMA.TABLES.Let us first create a table −mysql> create table viewtheauto_incrementValueForATableDemo    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(20)    -> ); Query OK, 0 rows affected (0.84 sec)Following is the query to insert some records in the table using insert command −mysql> insert into viewtheauto_incrementValueForATableDemo(StudentName) values('Ramit'); Query OK, 1 row affected (0.23 sec) mysql> insert into viewtheauto_incrementValueForATableDemo(StudentName) values('Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into viewtheauto_incrementValueForATableDemo(StudentName) values('Chris'); Query OK, 1 row affected (0.15 sec) mysql> ... Read More

To form a composite key to be unique, you need to use ADD UNIQUE command. Following is the syntax −alter table yourTableName add unique yourUniqueName( yourColumnName1, yourColumnName2, .......N);Let us first create a table. Following is the query −mysql> create table makeCompositeKeyDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(40),    -> StudentAge int,    -> StudentGrade char(1)    -> ); Query OK, 0 rows affected (2.34 sec)Now check the description of the table using DESC command. Following is the query −mysql> desc makeCompositeKeyDemo;This will produce the following output −+--------------+-------------+------+-----+---------+----------------+ | Field   ... Read More

In order to get the average row length of a table in MySQL, you can use INFORMATION_SCHEMA.TABLES. Let us first create a table. Following is the query −mysql> create table Client_information    -> (    -> Id int,    -> Name varchar(10)    -> ); Query OK, 0 rows affected (0.48 sec)Following is the query to insert some records in the table using insert command −mysql> insert into Client_information values(1, 'Larry'); Query OK, 1 row affected (0.14 sec) mysql> insert into Client_information values(2, 'Mike'); Query OK, 1 row affected (0.17 sec) mysql> insert into Client_information values(3, 'Sam'); Query ... Read More

To set blank spaces in column names with MySQL, you can use the concept of backticks. Let us first create a table. Following is the query −mysql> create table blankSpacesDemo    -> (    -> `Student Id` int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> `Student Full Name` varchar(100)    -> ); Query OK, 0 rows affected (0.51 sec)Following is the query to insert some records in the table using insert command −mysql> insert into blankSpacesDemo(`Student Full Name`) values('John Smith'); Query OK, 1 row affected (0.16 sec) mysql> insert into blankSpacesDemo(`Student Full Name`) values('Carol Taylor'); Query OK, 1 row ... Read More

Yes, you can set Auto Increment later with ALTER table. Let us first create a table. Here, as you can see, we haven’t set Auto Increment −mysql> create table forgetToSetAutoIncrementDemo    -> (    -> StudentId int,    -> StudentName varchar(30)    -> ); Query OK, 0 rows affected (1.17 sec)Now check the table description, there is no auto_increment column −mysql> desc forgetToSetAutoIncrementDemo;This will produce the following output −+-------------+-------------+------+-----+---------+-------+ | Field       | Type        | Null | Key | Default | Extra | +-------------+-------------+------+-----+---------+-------+ | StudentId   | int(11)     | YES  |   ... Read More

If you do not want all records that include “n” when you search for “ñ”, use the following syntax −select *from yourTableName where yourColumnName LIKE '%ñ%' COLLATE utf8_spanish_ci;Let us first create a table. Following is the query −mysql> create table NotIncludenDemo    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> ClientName varchar(20)    -> ); Query OK, 0 rows affected (1.07 sec)Following is the query to insert some records in the table using insert command −mysql> insert into NotIncludenDemo(ClientName) values('John'); Query OK, 1 row affected (0.21 sec) mysql> insert into NotIncludenDemo(ClientName) values('Johñ'); Query OK, ... Read More

To return record set order, you need to use FIND_IN_SET(). Let us first create a table −mysql> create table recordSetOrderDemo    -> (    -> EmployeeId int,    -> EmployeeName varchar(30)    -> ); Query OK, 0 rows affected (0.63 sec)Following is the query to insert some records in the table using insert command −mysql> insert into recordSetOrderDemo values(20, "John"); Query OK, 1 row affected (0.20 sec) mysql> insert into recordSetOrderDemo values(10, "Larry"); Query OK, 1 row affected (0.14 sec) mysql> insert into recordSetOrderDemo values(100, "Mike"); Query OK, 1 row affected (0.14 sec) mysql> insert into recordSetOrderDemo ... Read More

In order to return static strings in MySQL, you can use UNION. Following is the syntax −select 'yourStringValue1' as yourAliasName UNION select 'yourStringValue2' as yourAliasName;Let us implement the above syntax to return static strings in MySQL. Following is the query −mysql> select 'HELLO' as staticStringsResult    -> UNION    -> select 'MySQL' as staticStringsResult;This will produce the following output −+---------------------+ | staticStringsResult | +---------------------+ | HELLO             | | MySQL             | +---------------------+ 2 rows in set (0.00 sec)In some MySQL versions, the above syntax does not work, therefore you ... Read More