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  • SQL Update多表联合更新的方法

    SQL Update多表联合更新的方法

    (1) sqlite 多表更新方法

    update t1 set col1=t2.col1
    from table1 t1
    inner join table2 t2 on t1.col2=t2.col2
    

    这是一个非常简单的批量更新语句 在SqlServer中支持此语法 sqlite中却不支持

    sqlite中可转换为 如下语法

    update table1 set col1=(select col1 from table2 where col2=table1.col2)
    
    update ta_jbnt_tzhd_pht_Area_xiang set t1=(
        select sys_xzqhdm.name
        from sys_xzqhdm 
        where t2=sys_xzqhdm.code
    )
    

    (2) SQL Server 多表更新方法

    SQL Server语法:UPDATE { table_name WITH ( < table_hint_limited > [ ...n ] ) |
    view_name | rowset_function_limited } SET { column_name = { expression | DEFAULT
    | NULL } | @variable = expression | @variable = column = expression } [ ,...n ]
    { { [ FROM { < table_source > } [ ,...n ] ] [ WHERE < search_condition > ] } | [
    WHERE CURRENT OF { { [ GLOBAL ] cursor_name } | cursor_variable_name } ] } [
    OPTION ( < query_hint > [ ,...n ] ) ]
    

    SQL Server示例:

    update a set a.gqdltks=b.gqdltks,a.bztks=b.bztks
    from landleveldata a,gdqlpj b
    where a.GEO_Code=b.lxqdm
    

    access数据库多表更新方法

    x = "update " + DLTB + " a inner join tbarea2 b  on a.objectid=b.FID  set a." + fd_dltb_xzdwmj + "=b.area_xzdw, a." + fd_dltb_lxdwmj + "=b.area_lxdw";
     SQLList.Add(x);
    

    (3) Oracle 多表更新方法

    Oracle语法: 
    UPDATE updatedtable SET (col_name1[,col_name2...])= (SELECT
    col_name1,[,col_name2...] FROM srctable [WHERE where_definition])
    

    Oracel 示例:

    update landleveldata a set (a.gqdltks, a.bztks)= (
        select b.gqdltks,
        b.bztks
        from gdqlpj b
        where a.GEO_Code=b.lxqdm
    )
    

    (4) MySQL 多表更新方法

    MySQL语法: UPDATE table_references SET col_name1=expr1 [, col_name2=expr2 ...]
    [WHERE where_definition]
    

    MySQL 示例:

    update landleveldata a, gdqlpj b
    set a.gqdltks= b.gqdltks, a.bztks=b.bztks
    where a.GEO_Code=b.lxqdm
    
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  • 原文地址:https://www.cnblogs.com/fengzhentian/p/5537479.html
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