What is a Hashtag in SQL?

What is this symbol called in SQL?

The @CustID means it’s a parameter that you will supply a value for later in your code. This is the best way of protecting against SQL injection. Create your query using parameters, rather than concatenating strings and variables.

What does number sign mean in SQL?

An identifier that starts with a number sign denotes a temporary table or procedure. An identifier that starts with double number signs (##) denotes a global temporary object.

What is symbol in SQL query?

Arithmetic Operators

Symbol Operation
+ Addition
Subtraction
* Multiplication
/ Division

What is symbol in SQL Server?

Wildcard Characters in SQL Server

Symbol Description
_ Represents a single character
[] Represents any single character within the brackets
^ Represents any character not in the brackets
Represents any single character within the specified range

What does => mean in Plsql?

That is the keyword/value notation for passing parameters to a PL/SQL procedure or function. The left side is the name of the parameter, the right is the value being passed. It’s useful when you don’t want to keep to a specific ordering of parameters, or for self-documenting code.

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How do I use decode?

The DECODE function returns a value that is the same datatype as the first result in the list. If the first result is NULL, then the return value is converted to VARCHAR2. If the first result has a datatype of CHAR, then the return value is converted to VARCHAR2. If no matches are found, the default value is returned.

How do I get the sign of a number in SQL?

The SIGN() function returns the sign of a number.

This function will return one of the following:

  1. If number > 0, it returns 1.
  2. If number = 0, it returns 0.
  3. If number < 0, it returns -1.

What does dollar sign mean in SQL?

A dollar sign ($) followed by digits is used to represent a positional parameter in the body of a function definition or a prepared statement. … The semicolon (;) terminates an SQL command.

What is symbol called?

This table contains special characters.

Symbol Name of the Symbol Similar glyphs or related concepts
& Ampersand
⟨ ⟩ Angle brackets Bracket, Parenthesis, Greater-than sign, Less-than sign
‘ ‘ Apostrophe Quotation mark, Guillemet, Prime, foot (unit), minute
* Asterisk

How can I use SQL?

Uses of SQL

  1. Creating a new database with SQL and inserting new data in the database,
  2. Modifying or update previous data and retrieving data from the database,
  3. Deleting data and creating a new table in one database or even drop the table,

How do I get remainder in SQL?

SQL MOD() function is used to get the remainder from a division. The SQL DISTINCT command along with the SQL MOD() function is used to retrieve only unique records depending on the specified column or expression.

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How do I store special characters in SQL?

Use NVARCHAR instead of VARCHAR. SQL Server provides both datatypes to store character information. For the most part the two datatypes are identical in how you would work with them within SQL Server or from an application.

How do I use special characters in SQL?

List of special characters for SQL LIKE clause

  1. %
  2. _
  3. [specifier] E.g. [a-z]
  4. [^specifier]
  5. ESCAPE clause E.g. %30! %%’ ESCAPE ‘!’ will evaluate 30% as true.
  6. ‘ characters need to be escaped with ‘ E.g. they’re becomes they”re.

Which special characters are not allowed in SQL?

The use of special characters in regular identifiers is restricted. For example, a view name that begins with or consists only of numeric characters must be delimited because a regular identifier cannot begin with the characters 0 through 9, #, @, and $.