SQL
MySQL Views: Create, Join & Drop with Examples
MySQL Views: Create, Join & Drop with Examples A View in MySQL is a virtual table based on the result of a SQL query. It does not store data …
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How to convert SQL Server's timestamp column to datetime format
In SQL Server , the timestamp (or rowversion ) column is not a datetime value. It is a binary value used for versioning rows. If you need to conv…
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SQL Primary Key
Understanding SQL Primary Key In SQL, a Primary Key is a constraint that uniquely identifies each record in a table. It ensures that no two rows in …
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SQL CHECK Constraint
SQL CHECK Constraint The CHECK constraint in SQL is used to enforce specific rules for the values that a column can hold. It ensures that all rows i…
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SQL NOT NULL Constraint
SQL NOT NULL Constraint The NOT NULL constraint in SQL ensures that a column cannot have a NULL value. It enforces that every row must have a value…
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SQL UNIQUE Constraint
SQL UNIQUE Constraint The UNIQUE constraint in SQL ensures that all the values in a specified column or a combination of columns are distinct. It pr…
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SQL Foreign Key Constraint
SQL FOREIGN KEY Constraint A FOREIGN KEY is a column (or a set of columns) in one table that refers to the PRIMARY KEY in another table. It creates…
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SQL ALTER TABLE
Understanding SQL ALTER TABLE The SQL ALTER TABLE statement is used to modify the structure of an existing table. It allows you to add, delete, or c…
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SQL DROP TABLE
SQL DROP TABLE The DROP TABLE statement in SQL is used to delete an entire table from the database. This operation removes both the table structure …
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SQL TRUNCATE TABLE
SQL TRUNCATE TABLE The TRUNCATE TABLE statement in SQL is used to quickly delete all rows from a table without removing its structure or associate…
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SQL CREATE TABLE
Understanding SQL CREATE TABLE The SQL CREATE TABLE statement is used to create a new table in a database. A table consists of columns and rows, whe…
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SQL INSERT
Understanding SQL INSERT The SQL INSERT statement is used to add new rows of data into a table. It is one of the fundamental Data Manipulation Lan…
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SQL UPDATE
Understanding SQL UPDATE The SQL UPDATE statement is used to modify existing records in a table. It allows you to update one or more rows based on s…
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SQL DELETE
Understanding SQL DELETE The SQL DELETE statement is used to remove rows from a table. It allows you to delete specific rows based on conditions or …
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SQL ANY
Understanding the SQL ANY Operator The SQL ANY operator is used in conjunction with comparison operators (like = , < , > , <= , >= , an…
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SQL ALL
Understanding SQL ALL The SQL the ALL operator is used with comparison operators ( = , != , < , > , <= , >= ) to compare a value agains…
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SQL EXISTS Operator
Understanding the SQL EXISTS Operator The SQL EXISTS operator is used to check the existence of records returned by a subquery. It returns TRUE if…
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SQL MINUS
Understanding SQL MINUS The SQL MINUS operator is used to compare two SELECT queries and return the rows that are present in the first query but no…
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SQL Subquery
Understanding SQL Subqueries A subquery, also known as an inner query or nested query, is a query within another SQL query. The subquery provides dat…
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SQL Correlated Subquery
SQL Correlated Subquery A correlated subquery in SQL is a subquery that refers to columns from the outer query. It is evaluated once for every row p…
