Dynamically Get Values by Table Names
【Question】
I have 3 tables, as shown below. Table A stores table names.
Table A:
ID TableName
01 B
02 C
03 B
Table B:
ID Num
01 13
02 14
03 15
Table C:
ID Num
01 91
02 92
03 93
According to table A’s ID values, I want the following output:
ID Num
01 13
02 92
03 15
Is there any way of doing this? Thanks.
【Answer】
Your task is to find the value in table B or table C according to table A’s each record. It’s easy to write it dynamically in SPL (Structured Process Language):
| A |
|
| 1 |
=connect("test") |
| 2 |
=A1.query("select * from A") |
| 3 |
=A2.new(ID, A1.query("select VAL from"+TABLENAME+"where ID ="+ID).VAL:val) |
A1: Connect to the database.
A2: Retrieve data from table A and return it as a table sequence.
A3: Dynamical compose a SQL statement to make the query according to the TableNamevalue in each of A2’s record.
A1
A2
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