Shulou(Shulou.com)05/31 Report--

This article introduces the relevant knowledge of "what can be written in SQL instead of Like sentences". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

For example, to find all users whose user name contains "c", you can use the

Use mydatabase

Select * from table1 where username like'%c% "

Here is another way to accomplish the above functions:

Use mydatabase

Select * from table1 where charindex ('cantilever username) > 0

This method theoretically has one more judgment sentence than the previous method, that is, > 0, but this judgment process is the fastest. I think more than 80% of the operations are spent on finding words.

Strings and other operations, so using the charindex function is not a big deal. There are also advantages to using this method, that is, for%, | you can't use like directly.

The characters found can be directly used in this charindex, as follows:

Use mydatabase

Select * from table1 where charindex ('%', username) > 0

It can also be written as:

Use mydatabase

Select * from table1 where charindex (char (37), username) > 0

The character of ASCII is%

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