we encourage you to check out this guide onHow To Use Comparison and IS NULL Operators in SQL. Alternatively, if you’d like to learn how to use theLIKEoperator to filter data based
为了进行更强的过滤控制,SQL 允许给出多个WHERE子句。这些子句有两种使用方式,即以AND子句或OR子句的方式使用。 操作符(operator) 用来联结或改变WHERE子句中的子句的关键字,也称为逻辑操作符(logical operator)。 1.1 AND 操作符 要通过不止一个列进行过滤,可以使用AND操作符给WHERE子句附加条件。下面的代码给出了...
WHERE 比较运算符的使用方式如下: WHERE A operator B 练习:查询超过 20 岁的教师。select * from teachers where age > 20; 2.逻辑运算符:AND、OR、NOT ① 使用AND连接多条件: 使用SQL 中的逻辑运算符 AND 可以将 WHERE 子句中将两个或两个以上的条件结合起来,其结果是满足 AND 连接的所有条件的数据。
WHERE 比较运算符的使用方式如下: WHERE A operator B 练习:查询超过 20 岁的教师。select * from teachers where age > 20; 2.逻辑运算符:AND、OR、NOT ① 使用AND连接多条件: 使用SQL 中的逻辑运算符 AND 可以将 WHERE 子句中将两个或两个以上的条件结合起来,其结果是满足 AND 连接的所有条件的数据。
SELECT * FROM Customers WHERE Country = 'Spain' AND CustomerName LIKE 'G%' OR CustomerName LIKE 'R%'; Try it Yourself » Video: SQL AND Operator ❮ PreviousNext ❯ ★+1 Track your progress - it's free! Log inSign Up COLOR PICKER...
Example: SQL IN -- select rows if the country is either USA or UKSELECTfirst_name, countryFROMCustomersWHEREcountryIN('USA','UK'); Run Code Here, the SQL command selects rows if thecountryis either theUSAor theUK. Example: SQL IN Operator ...
Example: SQL AND Operator SQL OR Operator The SQLORoperator selects data if any one condition isTRUE. For example, -- select first and last name of customers-- who either live in the USA-- or have the last name 'Doe'SELECTfirst_name, last_nameFROMCustomersWHEREcountry ='USA'ORlast_nam...
Between...And-Operator Bestimmt, ob der Wert eines Ausdrucks innerhalb eines angegebenen Wertebereichs liegt. Sie können diesen Operator in SQL-Anweisungen verwenden. Syntax Ausdruck[Not]BetweenWert1ANDWert2 Die Syntax desBetween...And-Operators setzt sich wie folgt zusammen:...
The SQL AND OperatorThe WHERE clause can contain one or many AND operators.The AND operator is used to filter records based on more than one condition, like if you want to return all customers from Spain that starts with the letter 'G':...
The SQL ALL Operator TheALLoperator: returns a boolean value as a result returns TRUE if ALL of the subquery values meet the condition is used withSELECT,WHEREandHAVINGstatements ALLmeans that the condition will be true only if the operation is true for all values in the range. ...