How do I validate a phone number in SQL?

How do I validate a phone number in SQL?

In Oracle, you can check the validation of phone number by Regular Expression: CREATE TABLE Customer ( C_ID INT NOT NULL PRIMARY KEY, C_Name VARCHAR(255) NOT NULL, Phone char(10), CONSTRAINT valid_phone_number CHECK (REGEXP_LIKE(p_number, ‘^0\d{9}|\d{10}$’)) );

How do you write a number in a query?

SQL COUNT() Function

1. SQL COUNT(column_name) Syntax. The COUNT(column_name) function returns the number of values (NULL values will not be counted) of the specified column:
2. SQL COUNT(*) Syntax. The COUNT(*) function returns the number of records in a table:
3. SQL COUNT(DISTINCT column_name) Syntax.

How do you match text in SQL?

Pattern matching is a versatile way of identifying character data. In SQL, the LIKE keyword is used to search for patterns. Pattern matching employs wildcard characters to match different combinations of characters. The LIKE keyword indicates that the following character string is a matching pattern.

How do I match a substring in SQL?

SQL Server SUBSTRING() Function

1. Extract 3 characters from a string, starting in position 1: SELECT SUBSTRING(‘SQL Tutorial’, 1, 3) AS ExtractString;
2. Extract 5 characters from the “CustomerName” column, starting in position 1:
3. Extract 100 characters from a string, starting in position 1:

When to use the where clause in SQL?

The SQL WHERE clause is used to restrict the number of rows affected by a SELECT, UPDATE or DELETE query. The WHERE clause can be used in conjunction with logical operators such as AND and OR, comparison operators such as ,= etc.

How to get the number of columns in the where clause?

First, count the columns from the left to right in the data until reaches “Scott” in row # 1. You will get the number 8 (column H), right? By using the data as an expression (by surrounding the data by Curly Braces ), we can use column numbers in the Where clause.

How to write where clause in MySQL Query?

WHERE clause Syntax 1 “SELECT 2 FROM tableName” is the standard SELECT statement 3 “WHERE” is the keyword that restricts our select query result set and “condition” is the filter to be applied on the… More

Can you use double quotes in the where clause in SQL?

SQL requires single quotes around text values (most database systems will also allow double quotes). The following operators can be used in the WHERE clause: Not equal. Note: In some versions of SQL this operator may be written as !=