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❮ Previous SQL Editor Next ❯ SQL In Nested Query A nested query in SQL, often referred to as a subquery, is a query inside another query. It allows you to retrieve data from one table or use the result of one query as part of another query. Example: SELECT Column_Name1, Column_Name2, …., Column_NameN FROM […]

❮ Previous SQL Editor Next ❯ SQL Wildcard A wildcard character is used to substitute one or more characters in a string. Wildcard characters are used with the LIKE operator. The LIKE operator is used in a WHERE clause to search for a specified pattern in a column. Example: SELECT column_Name1, column_Name2 …., column_NameN FROM

❮ Previous SQL Editor Next ❯ SQL Like The LIKE is a logical operator in the Structured Query Language. This SQL operator is used in the WHERE clause with the following three statements: SELECT Statement UPDATE Statement DELETE Statement – It filters the records from the columns based on the pattern specified in the SQL

❮ Previous SQL Editor Next ❯ SQL Null First of all we should know what a null value is. Null values are used to represent missing unknown data. A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left

❮ Previous SQL Editor Next ❯ SQL Update The SQL commands UPDATE are used to modify the data that is already in the database. The SQL DELETE command uses a WHERE clause. SQL UPDATE statement is used to change the data of the records held by tables. Which rows are to be updated, is decided

❮ Previous SQL Editor Next ❯ SQL Insert SQL INSERT statement is a SQL query. It is used to insert a single or multiple records in a table. There are two ways to insert data in a table: 1. Specify both the column names and the values to be inserted: 2. If you are adding