Update Duplicate Value In Mysql With Nested Select Stack Overflow

Update Duplicate Value In Mysql With Nested Select Stack Overflow I have a table (tbl products) with the field of p id and prod skuid i wanted to update all duplicate prod skuid into my tbl products. here is my mysql script: concat(prod skuid, '', @count) as prod skuid, @row := prod skuid, @count := @count 1. from tbl product join (select @count := 0, @row := "") as t. When the query finds a duplicate and the on duplicate key update clause is activated, we can use the values(x) syntax to get the values that were to be inserted in the x column.

Nested Select Queries Mysql Sakila Database Stack Overflow With on duplicate key update, the affected rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values. This tutorial introduces the concept of nested select statements for advanced querying in mysql. a few included examples also illustrate possible use cases of this concept. You can use the function: insert into tablename set keyname = 'keyvalue', fieldname = 'fieldvalue' . . . on duplicate key update updatecounter = updatecounter 1, fieldname = values(fieldname) . . .;. I need to update a table with count (), avg (), and std () values that are calculated from data in a different table. is there a way to rewrite this query so that i'm not querying the second table three times? update table1 set table1.cnt= ( select count (*) from table2 where table1.foreign key=table2.primary key group by table2.primary key.

Sql Mysql Duplicate Records With Select Distinct Stack Overflow You can use the function: insert into tablename set keyname = 'keyvalue', fieldname = 'fieldvalue' . . . on duplicate key update updatecounter = updatecounter 1, fieldname = values(fieldname) . . .;. I need to update a table with count (), avg (), and std () values that are calculated from data in a different table. is there a way to rewrite this query so that i'm not querying the second table three times? update table1 set table1.cnt= ( select count (*) from table2 where table1.foreign key=table2.primary key group by table2.primary key. In assignment value expressions in the on duplicate key update clause, you can use the values (col name) function to refer to column values from the insert portion . 2 answers 5 if you want to change the value with the new one, you can use: on duplicate key update doctets = values(doctets) ; or if you want to add the new value to the existing one: on duplicate key update doctets = doctets values(doctets) ;. We update multiple columns on multiple rows with different values using the case statement that goes through all conditions and outputs an item (value) when the first condition is satisfied (like the if then else statement). Try joining the subquery (which i've modified) to the update statement: left join ( select puc prd name, puc avg ucost. from ( select puc prd name, puc avg ucost. ,row number() over (partition by puc prd name order by puc date desc) as rn. from lty prd u cost. ) b0. where b0.rn = 1 . on a.puc prd name = b.puc prd name.