zxing barcode generator example c# Select Count(CustomerId) From Customers in C#

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Select Count(CustomerId) From Customers
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Other functions available include: MIN, MAX, and AVERAGE. You should be aware that while the COUNT function merely counts each individual row, the other functions work with the value contained in each individual column. Thus, MAX and MIN will return the largest and smallest values found in that column, respectively. The AVERAGE function totals all the values found in that column and then divides by the number of rows. If you apply the AVERAGE function to a column that doesn t contain numeric values, you will get an error.
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Part 6: Excel and the Outside World: Collaborating Made Easy
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The Insert Statement
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The Insert statement adds a new row to a table. Here is its syntax:
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Insert [Into] <table> [(<column> [, <column> ] )] [Values (<value> [, <value> ] )]
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Where <table> is the name of the table where the new row will be added,<column> is the name of a column in the table, and <value> is the value for the corresponding column. Note
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Like the Select statement, the syntax presented here covers only part of the full syntax for the Insert statement. However, the information presented here will work on nearly any database server. Check your database vendor s documentation for the complete set of options for the Insert statement.
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Using the Insert Statement
You must specify the name of the table where the row will be added with the Insert statement; following the table name is an optional list of column names and a list of values to be inserted into the database. The position of each value in the list of values corresponds to the position of the column in the list of columns. If you don t specify all the columns in the Insert state ment, columns not listed will be set to Null. Although the list of column names is optional, you probably should list them anyway. Otherwise, you have to ensure that your values are listed in the same order that the columns are listed in the database. Although this isn t hard to verify, if you do make a mistake or, more importantly, if the database is changed, the order of the columns might change. Caution
If your table contains an Identity column, you should not include it in the list of columns when you execute an Insert statement. The database will generally return an error if you explicitly attempt to insert a value into the Identity column. There are techniques that might permit you to insert a value instead of relying on the database to automatically gen erate one. See your database system s documentation for more information.
Part 6: Excel and the Outside World: Collaborating Made Easy
22
The following statement shows how to insert a new row of data into the Customers table. The value 12345 is stored in the CustomerId column, a customer is stored in the Name column, and so forth. Any columns not specified in this list will contain Null.
Insert Into Customers (CustomerId, Name, Street, City, State, ZipCode) Values (12345, A customer , on a street , Tacoma, WA , 98422)
Excel and the Structured Query Language
The Update Statement
The Update statement changes the values for one or more columns in the table. Here is its syntax:
Update <table>
Set <column> = <value> [, <column> = <value>]
[Where <expression>]
Where <table> is the name of the table that you wish to update, <column> is the name of the column in the table, <value> is the new value that will be stored in the column, and <expression> is true for all the rows that should be updated. The Update statement provides a method that permits you to change the value of one or more columns in the table. You must explicitly specify each column that you wish to change, along with the column s new value. Also remember that the Update statement can include a Where clause. This Where clause is identical to the one you use in the Select statement and it works just like you would expect. Only the rows that match the expression in the Where clause will be updated the other rows will remain unchanged. Tip Limit Your Exposure If your Update statement doesn t have a Where clause, ask yourself Do I really want to change all the rows in the table If your answer is no, you had better double-check the statement before you try to execute it. In this example, the Where clause is used to identify all the rows that contain a Null value in the DateUpdated field. The DateUpdated column is then set to 01-Jan-2003 .
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