Label:The example of adding a drop-down box to a table is on the official website, but if the dropdown box data is requested from the database. There is a need for some attention. The first thing you want to achieve is as follows: The initial data of the table is empty, and the table data is obtained after clicking on
Problem descriptionThere is a data table (product label table, each product has a unique Sn, about 1 million per month). There are two linkage drop-down boxes on the query interface, [Specification] ____, [batch ]______After you select a specification (currently 200 specifications), list the batches of the production plan issued by this specification.
Original
While it's not recommended to use commands to delete things in a database table, these delete commands are always useful.When it comes to deleting table data, the biggest thing you can remember is the delete.However, we do database development and read database data. It's less for the other two brothers.Now to introduce the other two brothers, is to delete the table
can pass a constant string, perhaps "(Query not available)".) * * Completiontag is only set nonempty if we want to return a nondefault status. * * Completiontag May is NULL if caller doesn ' t want a status string. */voidprocessutility (Node *parsetree, const char *querystring, Processutilitycontext context, paramlistinfo params, Destreceiver *dest, Char *completiontag)The detailed call stack is as follows:#0 execdropstmt (STMT=0X17E9B40, istoplevel=1 ' \001 ') at Utility.c:1349#1 0x000000000
How to make a dynamic Drop-down list in an Excel table
By setting up data validation, you can directly refer to a range as the source of the sequence to complete the Drop-down list, but the entries in the resulting Drop-down list cannot automatically change as the number of data sources increases or decreases.
The
Label:DROP TABLESql-command:: = DROP TABLE [IF EXISTS] [database-name.] Table-nameThe DROP TABLE statement deletes the table created by the CREATE TABLE statement. The
Use the select drop-down menu to filter table content, selecttable
Use the select drop-down menu to filter table content:This section describes how to use the select drop-down menu to filter the content of a form. If the data volume is large and easy to search for, the filte
As we all know, drop table will seriously consume server I/O performance. If the size of the table to be dropped is large, it may even affect the normal online operation.
First, let's take a look at why a table with a large drop capacity affects online services.
Run
Sometimes in the online need to fill out some personal information, fill in the process we will see some things drop-down list to choose. In the WPS form, we can also add the Drop-down list to improve the speed of input. The following small series for you to introduce the next Drop-down list set up method.
I. Scope of selection
With the WPS Office 2012
In the WPS table in order to facilitate the specification of data entry, we often in the corresponding cell to provide a drop-down list to select input. But what if you need to set up a multilevel Drop-down list?
In a school with a high, senior high, three a total of three levels, each level of the department has 10 or so classes. In the past, when statistics st
Label: Turn : From http://blog.csdn.net/cyxlxp8411/article/details/7775113> Today , I reported ORA-00054 errors in the drop of a table. sql> drop table T2; drop TABLE T2 * ERROR at line 1: Ora-00054:resource busy and acquire
how to make a drop-down menu bar in the WPS table:
Create a new Excel table first.
After you save Excel, click the Insert option above.
At this point on the right-hand side of the toolbar will see a similar Drop-down list icon, named "combo box", click on the combo box icon.
Then
. in order to use the mouse to select a div, you need to dynamically add a style to the div , and pay attention to get the object and dynamically add the style after the " return False to prevent the event from bubbling . 4. When you just drag in, the position also takes into account the factors of the scroll bar . 5. set the div to resizable so that it can be dragged and resized . 3.3 Keyboard ActionKeyboard action is mainly selected after:Move up one pixel;Move down one pixel;Move one pixel t
Guidance:InOracleMay accidentally DROPTableIf regular backup is not performed, it will cause a lot of trouble. In some cases, daily data is very important, and the regular backup cycle is a little longer. I am afraid the situation is not optimistic! I used to know that Windows only has a recycle bin. Today I heard that Oracle also has a recycle bin!
But fortunately, Oracle has a recycle bin, which is exactly the same as the recycle bin in Windows.
For example, the following misoperation occurs
An exception occurred in the SQL Execution Plan after flashing back to drop to restore the table.----- Normal execution planSet autotrace traceonlySet linesize 1000Select/* + index (t idx_object_id) */* from t where object_id = 19;Execution Plan----------------------------------------------------------Plan hash value: 2041828949Bytes --------------------------------------------------------------------------
1. Two Ways to delete table dataA. Delete * From my_table;B. truncate table my_table;
2. Delete the entire tableDrop table my_table;
How can we recover tables accidentally dropped? In fact, Oracle also has a similar "recycle bin"
For example, you accidentally deleted the my_table table.Drop table my_table;When you u
[TEST1@ORCL] Sql>drop table T10; drop TABLE T10
* Line 1th Error: ORA-00604: Recursive SQL Level 1 error occurred
ORA-01422: The number of rows actually returned exceeds the requested number of rows
Check out the dual table.
There may be more than one row of data in the
Pivot Table extraction Non-Repeated Records (5)-cannot be used for drop-down
Key design points: no duplicates, pivot tables, drop-down options
Xiuxiu: Hum, although the pivot table is very strong, there are many weaknesses!
Ajin: Huh? -- Can you have such a deep understanding of pivot tables? You won't use it.
Xiux
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