database file tab and copy the path in the location (from the beginning to www.wangyeba.com, do not copy it later)
Now we can see the newly created database www.wangyeba.com. Right-click the database www.wangyeba.com and choose all tasks> Restore database.
A "Restore database" dialog box is displayed. Choose "device"> "disk"> "add"> "Browse" the backup database file.
Determine twice in a row, and then enable "option" to copy the copied path to "move to physical path" in the option. Note t
start "Options", copy the path we copied earlier to the "move to physical path" in the option, and note that only replace the _log and. mdf front, and then make sure to begin the restore
The restore end interface is as follows
Step three: Add an account number and password to the database
Expand the Console root directory--> security, select Login, right-click, we create a new login, pop-up SQL Server landing box, as shown in the following fig
an invalid database object
To adapt an object to alter directly from a query statement
Found unused variables and parameters
Download, install, hackBaidu Network disk : https://pan.baidu.com/s/1_hJBMIk0gPDfXIKpxu47Vw password: ifeq1. After download, unpack, open Sqlprompt_7.2.0.241.exe follow the prompts to complete the installation.when the installation is complete, disconnect the network! Open the database, you will see the SQL Prompt
original linkSelect the components you want, click here to choose All, install all componentsSelect the installation path, nextNextDefault instance, nextNextService account settings, choose to use the same account for all SQL Server servicesEnter the operating system's account name and password to determineNextAuthentication Mode: Mixed modeSet the password for the system administrator (SA)Click Add to specify the
tables.Next we look at the third line, which is the where clause. This is where we describe the conditions of the connection. Here, we want to confirm that the value of the Store_name field in the Geography table is equal to the value of the Store_name field in the store_information table. This WHERE clause is a connected soul character because its role is to determine the connection between the two tables is correct. If the WHERE clause is wrong, we are most likely to get a Cartesian connectio
integer PRIMARY KEY,Order_date datetime,Customer_sid integer REFERENCES CUSTOMER (SID),Amount double);The following example specifies a foreign key by changing the table schema.Here if the ORDERS table is already built. And the foreign key has not been specified:MySQL:ALTER TABLE ORDERSADD FOREIGN KEY (customer_sid) REFERENCES Customer (SID);Oracle:ALTER TABLE ORDERSADD (CONSTRAINT fk_orders1) FOREIGN KEY (customer_sid) REFERENCES Customer (SID);SQL
How to delete a data SQL statement in the mysql tutorial
The delete from statement is used to DELETE records FROM database tables.
Syntax
Delete from table_name WHERE column_name = some_value
Note: SQL is case insensitive. Delete from is equivalent to delete from.
In order for PHP to execute the preceding statement, we must use mysql_query (function. This functio
We have provided three functions not to filter some special characters, mainly using PHP to filter out the SQL sensitive string, well, let's look at the code below. Have a friend in need to take a look.
We have provided three functions not to filter some special characters, mainly using the PHP tutorial to filter out the SQL sensitive string, well, let's look at
In a 64-bit Win8 system, the Pl/SQL connection Oracle setup tutorial, win8oracle
On Windows 8 64-bit system, 64-bit Oracle is installed, but there is no 64-bit PL/SQL, And the Oracle database cannot be connected. What should I do? There are some methods: we can install a 32-bit Oracle client to achieve the connection.
First, download the 32-bit Oracle client:
we look at the third line, which is the where clause. This is where we describe the conditions of the connection. Here, we want to confirm that the value of the Store_name field in the Geography table is equal to the value of the Store_name field in the store_information table. This WHERE clause is a connected soul character, because its role is to determine the connection between the two tables is correct. Assuming that the WHERE clause is wrong, we are most likely to get a Cartesian connectio
Tags: SQL functionsSince many of the data in the database are digital, one important use is to be able to perform calculations on these numbers, such as aggregating them together or finding their average. SQL has a function that provides some of this type. They are:
AVG Average
COUNT Count
MAX (maximum value)
MIN (Minimum value)
SUM Sum
The syntax for applying a function is:Sel
Sometimes we decide that we need to clear a table from the database. In fact, if we can't do that, that would be a big problem, because the database Administrator-DBA is bound to be unable to manage the database efficiently.Fortunately, SQL has the syntax to provide a DROP table to let us clear the table. The syntax for DROP TABLE is:DROP table "table name";If we want to clear the customer form created in SQL
The purpose of the UNION all directive is to merge the results of the two SQL statements together. the union All and union differ in that union all lists each qualifying material, regardless of whether the data value is duplicated or not.The syntax for UNION All is as follows:[SQL Statement 1]UNION All[SQL statement 2];We use the same example as the previous pag
SQL server 2016 Installation Steps graphic tutorial, 2016 Installation Steps
1. Go to the installation center. Refer to the hardware and software requirements and see some instructions.
2. Select the new installation mode to continue installation
3. Enter the product key: the demo key is used here.
4. In the agreement, click agree and click Next to continue the installation.
5. Enter the global rule che
Mysql queries the implementation principle and code of SQL statements within a specified date. When designing a database tutorial, you must note that the time field is int (11). In this way, a digital date timestamp is stored in the database, we can use the mktime function to find the timestamp of the current date. in the database tutorial design, we must note th
Ubuntu SQL tutorial for mysql beginners
Ubuntu SQL tutorial for mysql beginners
1. Start the mysql database:
Effect:
2. Enter mysql:
Effect:
3. view all databases:
Effect:
4. Create a database:
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Oracle442 application scenarios --------- basic PL/SQL, basic plsql tutorial
Bytes -----------------------------------------------------------------------------------The Application Scenario 207---231 is skipped after the backup and restoration of the database .....The database network configuration is omitted, which is not very common in actual applications. Therefore, we will not explain it in detail here
SQL having instance tutorial
HavingIn the listen to have added to SQL, because where the keyword cannot use aggregate functions.SQL with syntax
SELECT column_name, Aggregate_function (column_name) from
table_name
WHERE column_name operator Value
GROUP by column_name has
aggregate_function (column_name) operator value
Let's look at an example of having on
"Persons" table above. We can use the following SELECT statement: TOP 2* FROM PersonsResults:
Id
LastName
FirstName
Address
City
1
Adams
John
Oxford Street
London
2
Bush
George
Fifth Avenue
New York
SQL TOP PERCENT InstancesNow, we want to select 50% of the records from the "Persons" table above. We can use the following SELECT statem
Tags: str span SQL statement pad Head for graph POS syntax The substring function in SQL is used to grab a portion of a field data. The name of this function is not exactly the same in different repositories:
Mysql:substr (), SUBSTRING ()
Oracle:substr ()
SQL server:substring ()
The most frequently used methods are the following (here we u
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