all logical operators in sql - PrivacyWall

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https://www.postgresql.org/docs/current/functions-logical.html

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PostgreSQL: Documentation: 17: 9.1. Logical Operators

The usual logical operators are available: boolean AND boolean → boolean boolean OR boolean → boolean NOT boolean → boolean. SQL uses a three-valued logic system with true, false, and null, which represents “ unknown ”.Observe the following truth tables:

https://sqlite.org/lang_expr.html

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SQL Language Expressions - SQLite

The EXISTS operator always evaluates to one of the integer values 0 and 1. If executing the SELECT statement specified as the right-hand operand of the EXISTS operator would return one or more rows, then the EXISTS operator evaluates to 1. If executing the SELECT would return no rows at all, then the EXISTS operator evaluates to 0.

https://airbyte.com/data-engineering-resources/advanced-sql-conce...

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15 Advanced SQL Concepts With Examples (2025 Edition)

Level up your SQL game! This guide dives into 15 advanced SQL concepts to make you a data pro. ... The LEFT JOIN includes all rows from the left table and matching rows from the right table. The result set will contain NULL for the rows that don’t have a matching row on the right side. ... The UNION operator combines the results of multiple ...

https://www.geeksforgeeks.org/sql-select-query/

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SQL SELECT Query - GeeksforGeeks

The SQL IN operator filters data based on a list of specific values. In general, we can only use one condition in the Where clause, but the IN operator allows us to specify multiple values. ... In SQL, the ALL and ANY operators are logical operators used to compare a value with a set of values returned by a subquery. These operators provide ...

https://www.tpointtech.com/sql-tutorial

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SQL Tutorial | Learn SQL for Beginners and Professionals - Java

Our SQL tutorial is designed for both beginners and professionals. SQL (Structured Query Language) is used to perform operations on the records stored in the database, such as updating records, inserting records, deleting records, creating and modifying database tables, views, etc. SQL is not a database system, but it is a query language.

https://www.postgresql.org/docs/current/functions.html

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Chapter 9. Functions and Operators - PostgreSQL

PostgreSQL provides a large number of functions and operators for the built-in data types. This chapter describes most of them, although additional special-purpose functions appear in relevant sections of the manual. Users can also define their own functions and operators, as described in Part V.The psql commands \df and \do can be used to list all available functions and operators, respectively.

https://www.postgresql.org/docs/current/functions-comparison.html

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9.2. Comparison Functions and Operators - PostgreSQL

Ordinary comparison operators yield null (signifying “ unknown ”), not true or false, when either input is null.For example, 7 = NULL yields null, as does 7 <> NULL.When this behavior is not suitable, use the IS [ NOT] DISTINCT FROM predicates:. a IS DISTINCT FROM b a IS NOT DISTINCT FROM b. For non-null inputs, IS DISTINCT FROM is the same as the <> operator.

https://stackoverflow.com/questions/43376860/union-intersect-or-e...

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sql - UNION, INTERSECT or EXCEPT operator must have an equal number of ...

Msg 205, Level 16, State 1, Line 2 All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal number of expressions in their target lists. Below given is the code: ... Issues with SQL Select utilizing Except and UNION All. 2. Error: All queries combined using a UNION, INTERSECT or EXCEPT operator must have an equal ...

https://cloud.google.com/spanner/docs/reference/standard-sql/func...

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Functions (alphabetical) in GoogleSQL | Spanner | Google Cloud

REGEXP_EXTRACT_ALL: Produces an array of all substrings that match a regular expression. REGEXP_REPLACE: Produces a STRING value where all substrings that match a regular expression are replaced with a specified value. REPEAT: Produces a STRING or BYTES value that consists of an original value, repeated. REPLACE

https://artoftesting.com/sql-queries-for-interview

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Top 50 SQL Query Interview Questions for Practice [2025] - ArtOfTesting

Here, we can simply use the ‘+’ operator in SQL. ... 32. Write an SQL query to fetch all the Employees who are also managers from the EmployeeDetails table. Here, we have to use Self-Join as the requirement wants us to analyze the EmployeeDetails table as two tables. We will use different aliases ‘E’ and ‘M’ for the same ...

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