- Society of communication Hythe
https://blog.csdn.net/blackfwhite/article/details/80382849
- Variable Institute variables
All the records.
Contain special characters
SQL query contains field contents underscore
* WHERE ename the FROM scott.emp the SELECT like '% \ _%' Escape '\';
the SELECT * WHERE REGEXP_LIKE scott.emp the FROM (ename, '_');
Wildcard Description
% replacement of one or more characters
_ substitute only one character
[the charlist] character string and any single character
[^ charlist]
or
[! the charlist]
is not in a character column of any single character
to "a" or "L" or "N" beginning with
WHERE City LIKE '[ALN]% '
not with "a" or "L" or "N" beginning with
WHERE City LIKE '[! ALN] %'
comprising "lond" the
WHERE City LIKE '% lond%'
to "Ne" starting
WHERE City LIKE 'Ne% '
in the multi-valued query
WHERE LastName iN (' Adams', 'Carter')
*/
--select top 50 * from SMInvoiceDetail where ChangeTime > '2017-06-25' and ChangeTime <= '2017-06-26'
--select top 1000 * from table order by 列 asc
--select top 1 * from SMHistory_InvoiceDetail where HistoryDetailID > 400
--select top 50 * from SMInvoiceHeader order by BDBillNo asc
/*
SELECT Persons.LastName, Persons.FirstName, Orders.OrderNo
FROM Persons
FULL JOIN Orders
ON Persons.Id_P=Orders.Id_P
ORDER BY Persons.LastName
*/
The SQL LIKE operator, wildcards, innocently tell the regular expression
in SQL There are four common wildcard
a '%' he may alternatively 0 or more characters, different action in different positions
syntax :( illustrate it, more illustrate the point)
F:
1. the SELECT Student from the above mentioned id the WHERE name like '% Li' '(expressed Find all name' Lee 'beginning
2. select id from student where name like '% Lee% '' (expressed Find all middle name 'Lee''s)
3. the SELECT Student from the above mentioned id the WHERE name like '% Li' '(represented find all the names at the end there' Lee ''s)
two .'_' he is to replace any single character, and different positions in effect, similar to the usage and '%', not go into here
three '[]', which put an arbitrary character string, the number is not limited to, any of the characters in parentheses represent numbers satisfying.
Note: the above and two different the wild card is no longer used in conjunction with LIKE, he is a regular contents inside, all usage is slightly different, to add to his front regexp keyword
F: select id from student where name regexp '[ Li Wang]'
representation Find all the names appearing in 'Lee' Or 'Wang' any student id
IV. '[!]' (Also written as [^]) which put arbitrary character string, the number is not limited, except satisfied by any character within the brackets, above which a contrast, but the use of similar , not repeat them here.
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author: qq_42806214
Source: CSDN
Original: https: //blog.csdn.net/qq_42806214/article/details/82354232
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