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Sadie News July 10, according to foreign media reports, Boston Consulting company released its latest report yesterday that Chinese consumers have become mobile communications, instant messaging and WEB2.0 mainstream users. China now has 500 million mobile subscribers and 210 million Internet users, the report said.In 2007 alone, China's mobile phone users increased by 80 million, and Internet users increased by 40 million. In addition to the young p

Distinct shows only one repeat of the value. No matter how many times this value appears, it appears only once. Select DISTINCT field name 1, field name 2 from table order by field name 1 It is best used in conjunction with the order by. can improve efficiency Sql>Sql> CREATE TABLE Employees (2 au_id CHAR (3) Not NULL,3 au_fname VARCHAR () not NULL,4 au_lname VARCHAR () not NULL,5 phone VARCHAR () NULL,6 address VARCHAR (m) NULL,7 City VARCHAR () NULL,8 State CHAR (2) NULL,9 Zip CHAR (5)

First_Name CHAR (50) Last_Name CHAR (50) Country CHAR (25) We can also connect two tables using a view table. In this case, the user can find the information she wants directly from a view table, without having to make a connection action from two different tables. Suppose you have the following two tables:store_information Form Store_name Sales Txn_date Los Angeles 1500 05-

Tags: SQL distinct The SELECT command allows us to read all the data from one or more fields in a table. This will take all the data out, regardless of whether the data values are duplicated or not. In data processing, we often encounter situations where we need to find out the different data values in the table. In other words, we need to know what the different values are in this table/field, and the number of times each value appears is not important. How is this going to be achi

choose between these two fields from small to large, then this clause will cause the result is based on "column one" from small to large rows. If there are several pieces of information "field one" value is equal, then these data will be based on "column two" from the small to large row.For example, if we want to list the information in the store_information form in the Sales column from the big to the small,store_information Form Store_name Sales Txn_date

Let's go back to the function now. Remember that we use the SUM command to figure out all sales (turnover)! What if our demand turns out to be to figure out the turnover (sales) of each store (store_name)? In this case, we have to do two things: first, we have to select both the Store_name and the Sales columns. Second, we need to make sure that all Sales are separately calculated according to each store_name. This syntax is:Select "Field 1", SUM ("Field 2")From "Table name"GROUP by "Field 1";In

behind the objects they are replacing, and they are separated by a blank space. We continue to use the store_information form to do an example:store_information Form Store_name Sales Txn_date Los Angeles 1500 05-jan-1999 San Diego 250 07-jan-1999 Los Angeles 300 08-jan-1999 Boston 700 08-jan-1999 We use the same exa

the object they are replacing. And the middle of them is separated by a blank.We continue to use the store_information form to do a sample:store_information Form Store_name Sales Txn_date Los Angeles 1500 05-jan-1999 San Diego 250 07-jan-1999 Los Angeles 300 08-jan-1999 Boston 700 08-jan-1999 We use the same example

, because these two instructions can be retrieved from multiple tables. Union only shows the two results together, not the two tables ........ The syntax of UNION is as follows: [SQL statement 1]UNION[SQL Statement 2] Let's say we have the following two tables, store_information table store_name sales date los Angeles $1500 jan-05-1999

An example of modeling a customer and its multiple address relationships Use normalized ( referenced ) and non-normalized ( inline ) storage, respectively: 1, standardized storage: (In a normalized data model, the address document contains a reference to a parent document, patron): { _id: "Joe", Name: "Joe Bookreader" } { patron_id: "Joe", Street: "123 Fake Street", City: ' Faketon ', State : ' MA ', zip: ' 12345 ' } { patron_id: ' Joe ', Street: ' 1 Some other Stre

Foundation; version 2 of the License.## This program is distributed in the hope that it will be useful,# but WITHOUT ANY WARRANTY; without even the implied warranty of# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the# GNU General Public License for more details.## You should have received a copy of the GNU General Public License# along with this program; if not, write to the Free Software# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston