Sql select statements

Chapter 3 - Structured Query Language. After completing this unit, you should be able to: Learn basic SQL statements for creating database structures, learn SQL statements to add data to a database, learn basic SQL SELECT statements and options for processing a single table, learn basic SQL SELECT statements for processing multiple tables with subqueries,...

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Managing Privileges A privilege is a right to execute a particular type of SQL statement or to access another user’s object. These include the right to: Connect to a database Create a table Select rows from another user’s table Execute another user’s stored procedure System privileges Each system privilege allows a user to perform a particular database operation or class of database operations; for example, the privilege to create tablespaces is a system privilege.

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SQL statements are not case sensitive. SQL statements can be on one or more lines. Keywords cannot be abbreviated or splitacross lines. Clauses are usually placed on separate lines. Indents are used to enhance readability.

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Purpose and importance of SQL, the main language for querying relational databases. How to retrieve data using the SELECT statement. How to insert data using the INSERT statement. How to update data using the UPDATE statement. How to delete data using the DELETE statement. About an alternative language for querying relational databases called QBE.

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Phần 2 SQL Advanced (bài 13) SQL SELECT INTO Statement : Câu lệnh SELECT INTO thường được dùng để tạo những back up hoặc của tables hoặc những bản ghi . Cú pháp : Trích: SELECT column_name(s) INTO newtable [IN externaldatabase] FROM source Sử dụng để backup

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[ Team LiB ] Recipe 4.14 Overcoming Keyword Conflicts When Using CommandBuilders Problem Your data includes table and column names that conflict with SQL keywords. You can overcome this with brackets or quotes in SELECT statements that you write, but the CommandBuilder creates illegal update statements.

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Figure 3.6: Products where ProductName is like 'Cha%' The next SELECT statement uses the LIKE operator to retrieve products where the ProductName column

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Figure 3.16: Using the DISTINCT keyword to retrieve distinct Country column values As you can see, the SELECT statement only displays Country column values that are unique: duplicate values are eliminated.

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The Fill() method then creates a DataTable in the DataSet with the specified name and runs the SELECT statement. The DataTable created in your DataSet is then populated with the rows retrieved by the SELECT statement.

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Performing a SQL SELECT Statement and Storing the Rows Locally In the example featured in this section, you'll see how to connect to the SQL Server

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In Chapter 20, you built SQL statements to retrieve and update rows in a database. You also learned all the variations of the SELECT statement. Some restrictions, however, can’t be expressed with a WHERE clause, no matter how complicated. To perform complicated searches, many programmers would rather write an application to retrieve the desired rows, process them, and then display some results. The processing could include running totals, formatting of the query’s output, calculations involving multiple rows of the same table, and so on. ......

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