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Return only the non-empty and non-null values from a table and fill the empty and NULL values with the corresponding column values in MySQL?
Let us first create a table −
mysql> create table DemoTable839( StudentFirstName varchar(100), StudentLastName varchar(100) ); Query OK, 0 rows affected (0.69 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable839 values('Chris','Brown'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable839 values('','Taylor'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable839 values(NULL,'Taylor'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable839 values('Adam','Smith'); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable839;
This will produce the following output −
+------------------+-----------------+ | StudentFirstName | StudentLastName | +------------------+-----------------+ | Chris | Brown | | | Taylor | | NULL | Taylor | | Adam | Smith | +------------------+-----------------+ 4 rows in set (0.00 sec)
Following is the query to return only the non-empty and non-null values from a table and fill the empty and NULL values with the corresponding column values−
mysql> select if(length(StudentFirstName),StudentFirstName,StudentLastName) from DemoTable839;
This will produce the following output −
+---------------------------------------------------------------+ | if(length(StudentFirstName),StudentFirstName,StudentLastName) | +---------------------------------------------------------------+ | Chris | | Taylor | | Taylor | | Adam | +---------------------------------------------------------------+ 4 rows in set (0.00 sec)
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