The SQL OR condition is used to test multiple conditions in a SELECT, INSERT, UPDATE, or DELETE statement. Any one of the conditions must be met for a record to be selected.Syntax The syntax for the OR condition in SQL is: WHERE condition1 OR condition2 ... OR condition_n; Parameters...
ANY 意味着如果对范围内的任何值进行操作为真,则条件将为真。...ALL 运算符 ALL 运算符返回布尔值作为结果,如果子查询值中的所有值都满足条件,则返回 TRUE。...使用 SELECT 的 ALL 语法 SELECT ALL column_name(s) FROM table_name WHERE condition; 使用 WHERE 或 HAVING 的 ALL...
SELECT * FROM table_name WHERE condition1 OR condition2; 在上述查询中,table_name是要查询的表名,condition1和condition2是两个条件。如果满足condition1或者condition2中的任意一个条件,该行将被返回。 SQL QUERY中使用OR操作符的优势是可以扩展查询条件,使得查询更加灵活。通过使用OR操作符,可以在一个查询中...
The SQL Server (Transact-SQL) OR condition is used to test multiple conditions where records are returned when any one of the conditions are met. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement. Syntax The syntax for the OR condition in SQL Server (Transact-SQL) is: WH...
DECLARE CONTINUE HANDLER FOR SQLSTATE'02000'SET done=1;--错误标记处理,放到最后再声明,要放到游标后面。--不然会报错:Variable or condition declaration after cursor or handler declaration DECLARE CONTINUE HANDLER FOR SQLEXCEPTION,SQLWARNING,NOT FOUNDset_err=1;--在开始循环之前修改数据,循环会使用新数据。
SQL Tuning/SQL Optimization Techniques: 1)The sql query becomes faster if you use the actual columns names in SELECT statement instead of than '*'. For Example:Write the query as SELECT id, first_name, last_name, age, subject FROM student_details; ...
No query specified 1.首先我们使用同一列带索引字段的进行查询。 mysql>explainselect*fromsbtest1wherek='501462'ork='502480';+---+---+---+---+---+---+---+---+---+---+---+---+|id|select_type|table|partitions|type|possible_keys|key|key_len|ref|rows|filtered|Extra|+---+---...
SqlSessionFactory sqlMapper = new SqlSessionFactoryBuilder().build(reader); // 获取SqlSession SqlSession sqlSession = sqlMapper.openSession(); } } 代码案例2: public void getQueryExampleByCondition(Example example, OrderQuery query) { Criteria criteria1 = example.createCriteria(); ...
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...
On the Create tab, in the Macros & Code group, click Query Design. On the Design tab, in the Query Type group, click Data Definition. The design grid is hidden, and the SQL view object tab is displayed. Type the following SQL statement: CREATE TABLE...