MySQL Articles - Page 87 of 439

SQLSQL, Structured Query Language is a non-procedural language and is used by database engines to interpret SQL queries to create/modify/access the database elements.T-SQLT-SQL, Transact-SQL, is a procedural extension to SQL, used by SQL Server. It is similar to PL/SQL of Oracle.Following are the important difference between SQL and T-SQL.Sr. No.KeySQLT-SQL1TypeSQL is non-procedural by nature.T-SQL is procedural by natue.2MethodsSQL provides data manipulation and controlling functions.With T-SQL, we can write own procedures, functions with local variables.3ProprietarySQL is open to use and is common across RDBMS softwares.T-SQL is specific to SQL Server and is proprietary.4Query orderMultiple querires are submitted one by one.Using T-SQL, ... Read More

SQL, Structural Query Language is a standard database language which is used create, maintain and retrieve the relational database whereas PL/SQL, Procedural Language extension to SQL, it extends SQL and provide it procedural capabilities.Following are the important differences between SQL and PL/SQL.Sr. No.KeySQLPL/SQL1DefinitionSQL, is Structural Query Language for database.PL/SQL is a programming language using SQL for a database.2VariablesSQL has no variables.PL/SQL has variables, data types etc.3Control StructuresSQL has no FOR loop, if control and similar structures.PL/SQL has FOR loop, while loop, if controls and other similar structures.4OperationsSQL can execute a single operation at a time.PL/SQL can perform multiple operation at ... Read More

MySQL is a relational database. MongoDB is NoSQL Database.Following are the important differences between MySQL and MongoDB.Sr. No.KeyMySQLMongoDB1Owned/Developed ByMySQL is owned by Oracle.MongoDB is developed by MongoDB Inc.2Data StorageMySql stores data in tabular format as records in table.MongoDB stores records as documents.3LanguageSQL, Structured Query Language is used to query database.Dynamic Schema. Predefined structure is defined for incoming data.4Design ObjectivesNo efficient replication and Sharding available.High availability, Scalability, Replication and Sharding are inbuilt.5TermsMongoDB uses Collection, Document, Field, Embedded Document, Linking etc.MySQL uses Table, Row, Column, Joins etc.6Data StorageMySQL stores data in forms of records in table.MongoDB stores data in form of JSON ... Read More

Both MySQL and SQL Server, both are relational database management systems or RDBMS. MySQL is open source and is free to use whereas SQL Server is licensed product of Microsoft.Following are the important differences between MySQL and SQL Server.Sr. No.KeyMySQLSQL Server1Owned/Developed ByMySQL is owned by Oracle.SQL Server is developed by Microsoft.2Language supportMySql supports programming languages like C++, Java and has running support for Perl, TCL and Haskel.SQL Server supports programming languages like C++, Java, Ruby, Visual Basic, Delphi, R.3Storage SpaceMySql needs less amount of operational storage space.SQL Server needs large amount of operational storage space.4Query CancellationMySql does not support midway ... Read More

For this, use BETWEEN keyword. Let us first create a −mysql> create table DemoTable1444    -> (    -> Value int,    -> PurchaseDate datetime    -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert −mysql> insert into DemoTable1444 values(40, '2019-01-10'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1444 values(100, '2019-10-03'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1444 values(170, '2019-11-21'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1444 values(70, '2018-12-05'); Query OK, 1 row affected (0.11 sec)Display all records from the table using ... Read More

You need to use GROUP BY clause. Let us first create a −mysql> create table DemoTable1443    -> (    -> StudentId int,    -> StudentScore int    -> ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert −mysql> insert into DemoTable1443 values(100, 78); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1443 values(101, 89); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1443 values(100, 88); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1443 values(101, 97); Query OK, 1 row affected (0.12 sec)Display all records from the ... Read More

Let us first create a −mysql> create table DemoTable1442    -> (    -> DueTime time    -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert −mysql> insert into DemoTable1442 values('00:08:00'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1442 values('00:04:00'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1442 values('12:55:00'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select −mysql> select * from DemoTable1442;This will produce the following output −+----------+ | DueTime  | +----------+ | 00:08:00 | | 00:04:00 | | 12:55:00 | ... Read More

MySQL will implicitly convert the column into a number. Following is the syntax −select * from yourTableName  order by yourColumnName*1;Let us first create a −mysql> create table DemoTable1441    -> (    -> Id varchar(30)    -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert −mysql> insert into DemoTable1441 values('301'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1441 values('23'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1441 values('345'); Query OK, 1 row affected (0.42 sec) mysql> insert into DemoTable1441 values('10'); Query OK, 1 row affected (0.23 sec) ... Read More

Use DEFAULT keyword in MySQL to set default value to NULL. Let us first create a −mysql> create table DemoTable1440    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(20) DEFAULT NULL,    -> StudentAge int DEFAULT NULL    -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command. For values left blank, the default gets inserted −mysql> insert into DemoTable1440(StudentName, StudentAge) values('Chris', 21); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1440 values(); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1440(StudentName) ... Read More

For specific value, use FIND_IN_SET(). Let us first create a −mysql> create table DemoTable1439    -> (    -> CountryId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> CountryCode varchar(20)    -> ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert −mysql> insert into DemoTable1439(CountryCode) values('1022_US, 7894_UK'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1439(CountryCode) values('6567_AUS, 7894_UK'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1439(CountryCode) values('6567_AUS'); Query OK, 1 row affected (0.09 sec)Display all records from the table using select −mysql> select * from DemoTable1439;This will produce the ... Read More