oracle Update a table with data from another table UPDATEtable1 t1SET(name,desc)=(SELECTt2.name, t2.descFROMtable2 t2WHEREt1.id=t2.id)WHEREEXISTS(SELECT1FROMtable2 t2WHEREt1.id=t2.id ) Assuming thejoinresultsinakey-preservedview, you could alsoUPDATE(SELECTt1.id, t1.name name1, t...
例如,UPDATE my_table SET column1 = 'new_value1', column2 = 'new_value2' WHERE condition;。在SET子句中,可以使用常量、表达式、子查询等来指定新值。例如,UPDATE my_table SET column1 = (SELECT another_column FROM another_table WHERE condition) WHERE condition;。这种灵活性使得SET子句可以处理各种...
We can UPDATE a table with data from any other table in SQL. Let us consider the following two tables. CREATE TABLE student_old ( student_id INT ,
在SQL Server 中,使用别名来更新表或列的语法如下: UPDATEtable_aliasSETcolumn_alias=new_valueFROMtable_name table_aliasJOINanother_table_name another_table_aliasONtable_alias.column_alias=another_table_alias.column_aliasWHEREcondition; 1. 2. 3. 4. 5. 6. 上述语法中,table_alias是表的别名,column_...
UPDATE TABLEA SET b = TABLEB.b1, c = TABLEB.c1, d = TABLEB.d1 FROM TABLEA, TABLEB WHERE TABLEA.a = TABLEB.a1 AND TABLEB.e1 > 40 GO Note: This is an extension in SQL Server i.e. the FROM clause – it does make it simple to understand and is a nice feature. ...
问UPDATE table with SELECT from another，但字段为SUM(someField)ENCREATE TABLE "TEST6" ( ...
For more information, see TOP (Transact-SQL). table_alias The alias specified in the UPDATE clause representing the table or view from which the rows are to be updated. server_name Is the name of the server (using a linked server name or the OPENDATASOURCE function as the server name) ...
sql="select sum(字段名) as 别名 from 数据表 where 条件表达式" set rs=conn.excute(sql) 用rs("别名") 获取统的计值,其它函数运用同上。 (5) 数据表的建立和删除: CREATE TABLE 数据表名称(字段1 类型1(长度),字段2 类型2(长度) …… ) ...
Update a field of a SQL table using a trigger from another table-field (PK) Good afternoon community, I have the following tables:dbo.RegistroGeneral: IdInpeccion (PK) int, IdEquipo int, IdEmpleado int, FechaFin datetime, FechaInicio datetimedbo.RegistroPasos: IdInspe...
UPDATE test tSETt.column_i='new_value'FROManother_table aWHEREt.id = a.test_id AND some_condition; 4. 特殊字符或大小写问题 虽然PostgreSQL默认是不区分列名大小写的(除非在双引号中定义),但如果你在创建表时使用了双引号包裹列名,并且列名中包含大写字母或特殊字符,那么在SQL语句中必须完全匹配(包...