Set empty strings ('') to NULL in the whole database

Question

In my database are many text columns where values are empty strings (\'\'). The empty strings need to be set to NULL. I do not know the exact schem

Answer 1

i think the code below is a generalised one. and you can use it any time anywhere:

    Declare @Query varchar(1000)
    declare @AllDatabaseTables table(id int,Table_Name varchar(50))
    Insert into @AllDatabaseTables select Table_Name from information_schema.tables

    declare @Table_Name varchar(50)

    declare @i int=1
    While @i<=(Select Count(*) from @AllDatabaseTables)
    BEGIN
    Select @Table_Name=Table_Name from @AllDatabaseTables Where id=@i

    Declare @ColumnTable table(id int,ColumnName varchar(100))
    Insert into @ColumnTable Select COLUMN_NAME from information_schema.columns Where Table_Name=@Table_Name and DATA_TYPE='varchar' --if the datatype is varchar type
    Declare @ColumnName varchar(50)
    Declare @k int=1
    While @k<=(Select count(*) from @ColumnTable)
        BEGIN
            Select @ColumnName=ColumnName from @ColumnTable where id=@k

            Set @Query='Update '+@Table_Name+' Set '+@ColumnName+'=NULL where '+@ColumnName+'='''' ' 
            Exec(Query)

            Set @k=@k+1
        END



    Set @i=@i+1

END