Also, it might be good to mention, the table I try to update (Companies) has over 1 million rows. Thanks in advance! fylkerin theUPDATEstatement. You should also be using a properjoin UPDATEcompanies cJOINkommuner kONc.forretningsadresse_kommune=k.kommuneNavnSETc.forretningsadresse_fylke=(SE...
UPDATEusersSETname='John Doe',age=(SELECTageFROMusersWHEREname='John')WHEREname='John'; 1. 2. 3. 这条SQL语句中,我们使用了子查询(SELECT age FROM users WHERE name = 'John')来获取John的年龄,并将其赋值给age字段。接着,我们将name字段的值更新为John Doe,并将age字段的值设置为25。最后,我们...
UPDATEtable_nameSETcolumn1=value1,column2=value2,...WHEREcolumnNIN(SELECTcolumnMFROManother_tableWHEREcondition); 1. 2. 3. table_name:要更新的目标表的名称。 column1 = value1, column2 = value2, ...:要更新的列及其对应的新值。 columnN:用于匹配子查询结果的列名。 another_table:用于子查询的...
update student s set city_name = (select name from city where code = s.city_code); REF: http://dba.stackexchange.com/questions/119621/how-to-update-10-million-rows-in-mysql-single-table-as-fast-as-possible http://stackoverflow.com/questions/6393763/fast-cross-table-update-with-mysql http...
好像只有在 mysql 中有此限制,解决方法就是不要在 update 的 where 语句中直接使用 select 子查询,再嵌套一层就可以了。。。 例如:update tablename set xx=0 where id in (select id from (select id from anothertable) as t)
To update a table from data in another table: UPDATE table1, table2 SET table1.field1 = table2.field1 WHERE table1.id = table2.id; For example: UPDATE transaction, member SET transaction.Memberid = member.memberId WHERE transaction.CardId = member.CardId; Share Improve this answer Fol...
UPDATE table_name SET column_name = ( SELECT column_name FROM another_table WHERE condition WHERE condition; 全选代码 复制 这个语句将会根据子查询的结果来更新指定列的值。 三、更新数据语句的注意事项 在使用MySQL更新数据时,还需要注意以下几点: ...
UPDATE wp_postmeta_temp SET meta_value = ( SELECT meta_value FROM wp_postmeta_import WHERE wp_postmeta_import.post_id = wp_postmeta_temp.post_id AND wp_postmeta_temp.meta_key = '_variation_description' ); The table have rows, for any post_id for exemple: meta_id: variable (82649,...
Re: Update from another table if substring exists in second table Peter Brawley May 31, 2021 01:02PM Re: Update from another table if substring exists in second table Gideon Engelbrecht June 01, 2021 04:21AM Sorry, you can't reply to this topic. It has been closed....
Re: Update from another table where partial string exist in other table Sébastien F. May 27, 2022 04:42PM Re: Update from another table where partial string exist in other table Gideon Engelbrecht May 27, 2022 11:54PM Sorry, you can't reply to this topic. It has been closed. ...