WHERE子句中可以使用以下运算符: 运算符 描述 = 等于 <> 不等于。 注意:在某些版本的SQL中,这个操作符可能写成!= > 大于 < 小于 >= 大于等于 <= 小于等于 BETWEEN 在某个范围内 LIKE 搜索某种模式 IN 为列指定多个可能的值 章节小测 现在,通过以下题目测测看您对“SQL WHERE Clause(查询子句)”的掌握程...
This SQL tutorial explains how to use the SQL WHERE clause with syntax and examples. The SQL WHERE clause is used to filter the results and apply conditions in a SELECT, INSERT, UPDATE, or DELETE statement.
WHERE name IN ('Google','菜鸟教程'); 1. 2. IN 与 = 的异同 相同点:均在WHERE中使用作为筛选条件之一、均是等于的含义 不同点:IN可以规定多个值,等于规定一个值 IN SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,...); = SELECT column_name(s) FROM table_name...
Where clauseis used to fetch a particular row or set of rows from a table. This clause filters records based on given conditions and only those row(s) comes out as result that satisfies the condition defined in WHERE clause of the SQL query. SQL Where Clause Syntax SELECTColumn_name1,Colu...
WHERE子句可以处理多种条件逻辑,包括,等于、不等于、大于、小于、LIKE模糊匹配等,相应地,它能够结合多个条件使用AND与OR运算符,这使得数据筛选可以更为灵活和精细。例如,查询同时符合多个条件的数据时,就非常依赖于这些关键逻辑符。 在理解WHERE子句之前,首先要掌握一些基本概念。WHERE是SQL中用于过滤数据的关键字,它...
<> Not equal. Note: In some versions of SQL this operator may be written as != Try it BETWEEN Between a certain range Try it LIKE Search for a pattern Try it IN To specify multiple possible values for a column Try itExercise? What is the purpose of the SQL WHERE clause? To specify...
java.sql.SQLSyntaxErrorException: Unknown column 'XXX' in 'where clause' at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120) ~[mysql...
使用关联查询,并用组合的字段,起别名的方式过滤,报错提示:SQL 错误 [1052] [23000]: Column 'code' in where clause is ambiguous selectconcat(ti.code,'-', sti.code)ascode, sti.*, ti.nameastask_namefromsub_task_info stileftjointask_info tionti.id=ti.task_idwherecodelike'%001%'; ...
limit 0, 10]; Column 'created_by' in where clause is ambiguous; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'created_by' in where clause is ambiguous 原因: 说明SQL语句中有重复的created_by功能调用,并且在Mapper文件中,多表关联查询中有相同的...
trim--trim typeforexpress mode load and external table load csv--csv format data filesforexpress mode load nullif--table level nullif clauseforexpress mode load field_names--field names settingforfirst recordofdata filesforexpress mode load ...