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Little-known Excel skills
I don't know if you are patient .. Haha
Maybe you have already completed hundreds of financial statements in Excel. Maybe you have used the EXCEL function to perform thousands of complex operations. Maybe you think that excel is just the same, or even nothing new. However, we repeatedly tried to use Excel 1% of all the skills on a daily basis. This topic starts with some little-known skills in Excel to learn about the different styles of Excel.
1. display different typ
Maybe you have already completed hundreds of financial statements in Excel. Maybe you have used the EXCEL function to perform thousands of complex operations. Maybe you think that excel is just the same, or even nothing new. However, we repeatedly tried to use Excel 1% of all the skills on a daily basis. This topic starts with some little-known skills in Excel to learn about the different styles of Excel.1. display different types of data in different colorsIn the
','Ole DB provider for jet ','Microsoft. Jet. oledb.4.0 ','C:/msoffice/access/samples/northwind. mdb'Go
C. Use the Microsoft ole db provider for OracleIn this example, create a connection server named London mktg, which uses the Microsoft ole db provider for Oracle and assumes that the SQL * Net alias of this oracle database is myserver.
Use masterGo-- To use named parameters:Exec sp_addmediaserver@ Server = 'London mktg ',@ Srvproduct = 'oracle ',@ Provider = 'msdaora ',@ Datasrc = 'myserver'G
, very happy. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game. The above situation, that is what we call dirty read , two concurrent transactions, "transaction A: lead to Singo payroll", "Transaction B:singo query
, very happy. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game.The above situation, that is what we call dirty Read, two concurrent transactions, "transaction A: lead to Singo payroll", "Transaction B:singo query
DEPTNO Department Number, COUNT (*) as department number, sum (SAL) departmental payroll sum from EMP GROUP by DEPTNO ORDER by SUM (SAL) DESC;The results are not posted, and you can see that the entire EMP table is divided into three pieces of data, each piece of data for a department, for the group function, it does not care about each group in the end is composed of who, or relative to the individual, the group function is to stand on a macro point
the following definitions to control the method and the overriding of the attributes
Overridable--Let the attributes and methods in the inheritance of Class can override
Overrides--Defining the nature or method of which foundation to override
NotOverridable (Preset)--class override to prevent belonging or methods from being inherited
MustOverride--requires that the class of inheritance must be override or method
Code examples such as the lower Imports System
Namespace MyName
, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game.
The above situation, that is what we call dirty Read, two concurrent transactions, "transaction A: lead to Singo payroll", "Transaction B:singo query Payroll account", transaction B read the transaction A has not yet
committed
X
√
√
REPEATABLE READ
X
X
√
Serializable
X
X
X
Note: We discuss the isolation level scenario, mainly in the case of multiple transactions concurrency, so the next explanation is around the transaction concurrency. READ UNCOMMITTED not submitted
The company paid, the leader of the 5000 yuan to the Singo account, but the transaction did not submit, and Singo just to check the account, found that the salary has been t
Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game.The above situation, that is what we call dirty Read, two concurrent transactions, "transaction A: lead to Singo payroll", "Transaction B:singo query Payroll account", transaction B read the transact
. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game. The above situation, that is what we call dirty Read, two concurrent transactions, "transaction A: lead to Singo payroll", "Transaction B:singo query
yuan to the Singo account, but the transaction did not submit, and Singo just to check the account, found that the salary has been to the account, is 5000 yuan whole, very happy. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game. The above situation, that is what we
yuan to the Singo account, but the transaction did not submit, and Singo just to check the account, found that the salary has been to the account, is 5000 yuan whole, very happy. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game. The above situation, that is what we
multiple transactions concurrency, so the next explanation is around the transaction concurrency. READ UNCOMMITTED not submittedThe company paid, the leader of the 5000 yuan to the Singo account, but the transaction did not submit, and Singo just to check the account, found that the salary has been to the account, is 5000 yuan whole, very happy. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, mo
the account, found that the salary has been to the account, is 5000 yuan whole, very happy. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game. The above situation, that is what we call dirty Read, two concurrent transactions, "transaction A: lead to Singo
performance advantage." For example, the more powerful the server is, the more we have the opportunity to bring a better product to our customers, however, the increasing number of server processor cores also makes it possible for terminal user to run more virtual machines on each server using the same number of devices, which can be reduced by the change in the sales performance. If we do not make adequate adjustments to the new technology development trend for solutions and products, it is li
Maybe you have already completed hundreds of financial statements in Excel. Maybe you have used the EXCEL function to perform thousands of complex operations. Maybe you think that excel is just the same, or even nothing new. However, we repeatedly tried to use Excel 1% of all the skills on a daily basis. This topic starts with some little-known skills in Excel to learn about the different styles of Excel.1. display different types of data in different colorsIn the
user and mode, user and schema.
I finally figured out what schema is, so let's talk about why schema is needed.
Continue.2. Why do I need the mode?
In many cases, I need to know what the concept is and why it is needed. In this way, we will remember more firmly, become more interested, and make changes and innovations.
Why do we need a mode? We know that users need a password to log on, and the mode corresponds to users one by one. By the way, this is a security consideration.
Think about it. J
transaction did not submit, and Singo just to check the account, found that the salary has been to the account, is 5000 yuan whole, very happy. Unfortunately, the leadership found that the amount of wages issued to Singo is not correct, is 2000 yuan, and then quickly rolled back to business, modify the amount, the transaction will be submitted, and finally singo the actual salary of only 2000 yuan, Singo empty joy a game. The above situation, that is what we call dirty Read, two concurrent tra
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