Contents
What is a non query?
ExecuteNonQuery : ExecuteNonQuery used for executing queries that does not return any data. It is used to execute the sql statements like update, insert, delete etc. ExecuteNonQuery executes the command and returns the number of rows affected.
Which are the three types of SQL statements?
Types of SQL Statements
- Data Definition Language (DDL) Statements.
- Data Manipulation Language (DML) Statements.
- Transaction Control Statements.
- Session Control Statements.
- System Control Statement.
- Embedded SQL Statements.
Can you describe the parts of a SQL statement?
The Structured Query Language (SQL) is the set of instructions used to interact with a relational database. SQL has three main components: the Data Manipulation Language (DML), the Data Definition Language (DDL), and the Data Control Language (DCL).
What is query and non query?
ExecuteNonQuery used for executing queries that does not return any data. It is used to execute the sql statements like update, insert, delete etc. ExecuteNonQuery executes the command and returns the number of rows affected.
What are SQL statements?
A statement is any SQL command such as SELECT, INSERT, UPDATE, DELETE. A query is a synonym for a SELECT statement. Expressions, which can produce either scalar values or tables consisting of columns and rows of data.
What are the parts of an SQL expression?
About SQL Expressions
- The select list of the SELECT statement.
- A condition of the WHERE clause and HAVING clause.
- The CONNECT BY , START WITH , and ORDER BY clauses.
- The VALUES clause of the INSERT statement.
- The SET clause of the UPDATE statement.
What is difference between execute and non query?
ExecuteNonQuery: Executes Insert, Update, and Delete statements (DML statements) and returns the number of rows affected. ExecuteReader: Executes the SQL query (Select statement) and returns a Reader object which can perform a forward only traversal across the set of records being fetched.
What should I know about single table queries?
The chapter then covers other aspects of single-table queries, including predicates and operators, CASE expressions, NULL marks, all-at-once operations, manipulating character data and date and time data, and querying metadata. Many of the code samples and exercises in this book use a sample database called TSQL2012.
What is the meaning of contains in Transact-SQL?
CONTAINS is a predicate used in the WHERE clause of a Transact-SQL SELECT statement to perform SQL Server full-text search on full-text indexed columns containing character-based data types. CONTAINS can search for: A word or phrase. The prefix of a word or phrase.
What does it mean when SQL Server contains only noise words?
If a noise word is used in a single word search, SQL Server returns an error message indicating that the query contains only noise words. SQL Server includes a standard list of noise words in the directory MssqlBinnFTERef of each instance of SQL Server.
When to use single quotes, double quotes, and backticks in SQL?
ISO/ANSI SQL) has a different set of quotes: double quotes are for delimited identifiers, e.g. “tablename”, and single quotes are for literals, e.g. ‘this is a some text’. Back-ticks are never used in standard SQL. (If you need to include a double quote in an identifier, type it twice as “odd””tablename”.