- Trending Categories
- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Found 4219 Articles for MySQLi
947 Views
Let us create a custom function to validate date in MySQL −mysql> set global log_bin_trust_function_creators=1; Query OK, 0 rows affected (0.03 sec) mysql> delimiter // mysql> create function isValidDate(actualDate varchar(255)) returns int -> begin -> declare flag int; -> if (select length(date(actualDate)) IS NOT NULL ) then -> set flag = 1; -> else -> set flag = 0; -> end if; -> return flag; -> end -> // Query OK, 0 rows affected (0.11 sec) mysql> delimiter ;Case 1 −When parameter is null value i.e. the date to be ... Read More
324 Views
Set the column as BOOLEAN to display 0 and 1 values. Let us create a table −mysql> create table DemoTable2035 -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> isMarried boolean, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2035(Name, isMarried) values('Chris', true); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable2035(Name, isMarried) values('David', false); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable2035(Name, isMarried) values('Bob', true); Query OK, 1 ... Read More
859 Views
To declare a variable, use DECLARE in a MySQL stored procedure. Let us first create a table −mysql> create table DemoTable2034 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentAge int -> ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2034(StudentName, StudentAge) values('Chris', 23); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable2034(StudentName, StudentAge) values('David', 21); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable2034(StudentName, StudentAge) values('Robert', 25); Query OK, 1 row ... Read More
3K+ Views
For dynamic SQL query in a stored procedure, use the concept of PREPARE STATEMENT. Let us first create a table −mysql> create table DemoTable2033 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2033(Name) values('Chris'); Query OK, 1 row affected (0.85 sec) mysql> insert into DemoTable2033(Name) values('Bob'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable2033(Name) values('David'); Query OK, 1 row affected (0.24 sec) mysql> insert into ... Read More
219 Views
To detect the existence of a table, use the concept of INFORMATION_SCHEMA.TABLES. Following is the syntax −select table_name from information_schema.tables where table_schema=database() and table_name=yourTableName;To understand the above syntax, let us create a table −mysql> create table DemoTable2032 -> ( -> ClientId int, -> ClientName varchar(20), -> ClientAge int, -> ClientCountryName varchar(20) -> ); Query OK, 0 rows affected (1.07 sec)Here is the query to detect if a table exist in a database −mysql> select table_name from information_schema.tables -> where table_schema=database() -> and table_name='DemoTable2032';This will produce the following output ... Read More
1K+ Views
Here, we are taking BIGINT type, since it takes 8 byte signed integer. Let us first create a table with column as BIGINT type −mysql> create table DemoTable2031 -> ( -> ByteValue bigint -> ); Query OK, 0 rows affected (1.17 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2031 values(1048576); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable2031 values(1073741824); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable2031;This will produce the following output −+------------+ | ByteValue | ... Read More
1K+ Views
To find maximum value, use MAX() along with CAST(), since the values are of VARCHAR type. Let us first create a table −mysql> create table DemoTable2030 -> ( -> Value varchar(20) -> ); Query OK, 0 rows affected (0.44 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2030 values('8'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable2030 values('1'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable2030 values('10001'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable2030 values('901'); Query OK, 1 row affected ... Read More
462 Views
Let us first create a table −mysql> create table DemoTable2029 -> ( -> Id int, -> FirstName varchar(20), -> LastName varchar(20) -> ); Query OK, 0 rows affected (0.98 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2029 values(1, 'Chris', 'Brown') -> ; Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable2029 values(2, 'David', 'Miller'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable2029 values(3, 'John', 'Smith'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable2029 values(4, 'John', 'Brown'); Query OK, 1 ... Read More
354 Views
Let us first create a table −mysql> create table DemoTable2028 -> ( -> StudentFirstName varchar(20), -> StudentLastName varchar(20) -> ); Query OK, 0 rows affected (0.87 sec)Here is the query to create a stored procedure and insert values (using delimiter correctly) −mysql> delimiter // mysql> create procedure insert_name(in fname varchar(20), in lname varchar(20)) -> begin -> insert into DemoTable2028 values(fname, lname); -> end -> // Query OK, 0 rows affected (0.17 sec) mysql> delimiter ;Call the stored procedure using CALL command −mysql> call insert_name('Chris', 'Brown'); Query OK, 1 row affected (0.17 sec)Display ... Read More
338 Views
Let us first create a table −mysql> create table DemoTable2027 -> ( -> UserId int -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable2027 values(10); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable2027 values(20); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable2027 values(31); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable2027 values(11); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable2027;This will produce ... Read More