其中,“%”代表零个或多个字符,而“_”则代表一个单个字符。 例如,使用LIKE运算符,我们可以查询所有名为“张”的用户记录,如果想要找到以“张”开头的所有名字,可以执行如下SQL语句: SELECT*FROM users WHERE name LIKE'张%'; 上述SQL语句会返回所有名字以“张”字开头的用户信息。 在深入学习LIKE运算符的使用
There are two wildcards often used in conjunction with theLIKEoperator: The percent sign%represents zero, one, or multiple characters The underscore sign_represents one, single character You will learn more aboutwildcards in the next chapter. ...
NOT essentially negates what’s in the WHERE clause. The above query returns records where the last name begins with ‘ac’; putting a NOT in front of LIKE returns the records that do not begin with ‘ac’ and end with anything. /* mssqltips.com */ SELECT [LastName] , [FirstName]...
The LIKE operator in SQL is used with the WHERE clause to check if a value matches a given string. In this tutorial, we'll learn about the LIKE clause in SQL and how to use them with examples.
SQL wildcards can substitute for one or more characters when searching for data in a database. SQL wildcards must be used with the SQL LIKE operator. With SQL, the following wildcards can be used: SQL Wildcard Examples We have the following "Persons" table: ...
AND(姓名=’joe’ OR 姓名=’rose’)---括号的意思是让括号里面的运行顺序先于AND IN 相当于OR的简便写法 Where name IN (joe,rose) XORExclusive OR (XOR). Exclusive OR (XOR). 5.字符串模糊查询:LIKE --查询A开头的first name SELECT * FROM student WHERE ...
dataView.RowFilter = "Id NOT IN (1, 2, 3)" // values not from the list Operator LIKE is used to include only values that match a pattern with wildcards. Wildcard character is * or %, it can be at the beginning of a pattern '*value', at the end 'value*', or at both '*va...
The LIKE operator can be used in the SELECT and WHERE clause of DML queries like SELECT, INSERT, UPDATE or DELETE. There are two wildcard characters that can be used with the LIKE operator % represents zero, one or more characters or numbers. ...
There are some ways to write a Linq query that reaults in using Like Operator in the SQL statement: 1. Using String.StartsWith or String.Endswith Writing the following query: var query =from cin ctx.Customers where c.City.StartsWith("Lo") ...
上述两种语句虽然得到的结果是一样的,但从内部运行来看,第二句SQL的执行速度更快些,因为第一句SQL(基于where索引查询的方式)还需要进行相关性的排序统计,而第二种方式是不需要的。 还可以通过SQL语句查询相关性: SELECT *, MATCH ( title, body ) against ( 'MySQL' ) AS Relevance ...