Wildcard Characters in SQL The wildcard characters are part of the SQL standard, so they work in Oracle, SQL Server, MySQL, and PostgreSQL. These characters are: You can use these characters inside a string to ask the database engine to substitute other characters. How do you do that? Yo...
Wildcard Stringis a combination of strings and wildcard characters For example, -- select rows where the last name-- of customers start with RSELECT*FROMCustomersWHERElast_nameLIKE'R%'; Run Code Here,%(zero or more characters) is a wildcard. So, the SQL command selects customers whoselas...
These wildcard characters can be used in string comparisons that involve pattern matching, such as LIKE and PATINDEX. Examples A: Simple example The following example returns names that start with the letter m. [n-z] specifies that the second letter must be somewhere in the range from n to...
These wildcard characters can be used in string comparisons that involve pattern matching, such as LIKE and PATINDEX. Examples A: Simple example The following example uses the [^] operator to find the top 5 people in the Contact table who have a first name th...
These wildcard characters can be used in string comparisons that involve pattern matching, such as LIKE and PATINDEX. Examples A: Simple example The following example uses the [^] operator to find the top 5 people in the Contact table who have a first name that starts with Al and has a...
Matches any single character within the specified range or set that is specified between the brackets. These wildcard characters can be used in string comparisons that involve pattern matching, such as LIKE and PATINDEX. For more information, see Pattern Matching in Search Conditions....
wildcard characters. During pattern matching, regular characters must exactly match the characters specified in the character string. However, wildcard characters can be matched with arbitrary fragments of the character string. Using wildcard characters makes theLIKEoperator more flexible than using the=...
expr1[NOT]Betweenvalue1Andvalue2 In Microsoft Access SQL,value1can be greater thanvalue2; in ANSI SQL,value1must be equal to or less thanvalue2. Microsoft Access SQL supports both ANSI SQL wildcard characters and Microsoft Access-specific wildcard characters to use with t...
Matches any string of zero or more characters. This wildcard character can be used as either a prefix or a suffix. For more information, see Pattern Matching in Search Conditions.Transact-SQL Syntax ConventionsExamplesThe following example returns all the first names of people in the Contact ...
1. 通配符(Wildcard) 通配符用于模糊匹配文本字段。在MySQL中,常见的通配符有两个:百分号(%)和下划线(_)。 百分号(%):匹配任意字符(包括零个字符)。 下划线(_):匹配任意单个字符。 下面是一个示例,查询名字以字母"J"开头的员工: SELECT*FROMemployeesWHEREfirst_nameLIKE'J%'; ...