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Anonymous users2024-02-06In order, remember to turn it off when you are finished.
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Anonymous users2024-02-05set conn1="")
Huai Min"Count the lead blind branch database 1 path")
set conn2="")
Database 2 Road God Reed Trail")
set rs1="")
select * from database 1",conn1,1,1set rs2="")
select * from database 2",conn2,1,1
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Anonymous users2024-02-04Read n, it's all the same.
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Anonymous users2024-02-03There is no limit to how many databases you can open, it just has to do with your program design. It is enough to design two database connections in the program, and you can use different connections to call different content. It can be achieved.
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Anonymous users2024-02-02If the two data tables are related, we recommend that you use SQL statements to join the tables, so that the fields in the two tables can be unified into one query table.
For example: select * from a inner join b on
This is to display the data rows in table A and table B that are the same as the aid. If you want to display the fields of table b, add them.
select b.*
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Anonymous users2024-02-01The principle is the same, loop the first query first, and then the query in the loop shows another query, I don't know if you understand it.
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Anonymous users2024-01-31First use a double loop, then use recursive classification combination, and it's fine, it's very simple.
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Anonymous users2024-01-30set rs1=...Open Table 1 and set the search conditions for Table 1.
rs1("Class**")=123
set rs2=...Open Table 2 and result from Table 1 rs1 ("Class**")=123 Set the search conditions in Table 2.
Loop output, that's pretty much it.
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Anonymous users2024-01-29Set rs1 = .Open Table 1
Set table query conditions.
rs1 (class **) = 123
Set rs2 = ..Open Table 2
According to the results of Table 1, rs1 (class **) = 123 sets are found in Table 2.
Loop output. That's pretty much it!
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Anonymous users2024-01-28The use of the database in the bank is basically the same as the description of the landlord, which belongs to distributed data processing, a point is a database, and the points are accessed from each other, and sometimes they need to be updated synchronously.
No matter how many databases (how many tables are in them) to be processed, we need to connect them one by one to read or update.
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Anonymous users2024-01-27It should be possible to query the information of these two databases and tables first, and put them in an asp table before operating.
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Anonymous users2024-01-26In the background, you can combine the data of two tables into a single data table (corresponding to the field name) and output it to the view.
Create a database.
Select the Program Management SQL Server 2008 SQL Server Management Studio command in the Start menu to open the SQL Server Management Studio window and establish a connection using Windows or SQL Server authentication. >>>More
The database is generally composed of many tables, for example, the school builds a database, which can build a student table (including the student's name, age, student number, class, date of birth), a teacher table (including the teacher's name, age, teaching class, teaching category), a report sheet (including the student's student number, and the grades of each subject), etc. These are the ways in which the files are stored in the database, and try to make sure that the items in a table are closely related and have the same attributes, if this condition cannot be met, a table must be built (the redundancy of the built table has 4 levels). In order to meet the user's query needs, we also need to make a number of views, for example, you can make a view of his items have the name of the student, age, grades of each subject, and the teacher of each subject, etc., we can also export new items according to the existing items, for the purpose of simplicity, for example, the view can add an average grade, we add different permissions and roles to each view, and provide it to different people to query to protect the security of the database. >>>More
select ,from emp e left jion dept don ;
Left Company. The left link is, the left side prevails, and the right side is useless to make up for it. >>>More
It seems that there is something called triggers in the DB, and there seems to be another thing called transactions.
When changes to data affect the index, the information in the index can be spread out across the database. Reindexing reorganizes the storage of indexed data (and in the case of clustered indexes, table data) and defragments it. This improves disk performance by reducing the number of page reads required to obtain the requested data. >>>More