两个查询分开工作。 组合时出错。 如何在 Libreoffice Base 中合并两个 SELECT 语句？

Question

I've reached a point with a spreadsheet where it is no longer viable to keep data in that format. I've created a table in Libreoffice Base with the relevant information and I'm trying to put together some queries. Unfortunately, my attempts to create a SQL query are so far being met with syntax errors. To be expected, given it's all new to me.

Here's my example table:

TINYINT-A	TINYINT-B	NUMERIC-A	NUMERIC-B	BOOLEAN-A	BOOLEAN-B
1	2	100	200	1	0
9	8	900	800	0	1

I have the following query running fine:

SELECT 
  SUM("TINYINT-A") AS "First Column", 
  SUM("TINYINT-B") AS "Second Column", 
  SUM("NUMERIC-A") AS "Third Column", 
  SUM("NUMERIC-B") AS "Fourth Column"
FROM 
  "Table-A"

Output would be:

First Column	Second Column	Third Column	Fourth Column
10	10	1000	1000

I would like to add a fifth column which sums up the rows in one of the previous four column when the boolean value is equal to 1 or 0. As a separate query, I can do this:

SELECT 
  SUM("NUMERIC-A") AS "BOOLEAN-A-NUMERIC-A", 
  SUM("NUMERIC-B") AS "BOOLEAN-A-NUMERIC-B"
FROM 
  "Table-A" 
WHERE 
  "BOOLEAN-A" = 1

Expected output:

BOOLEAN-A-NUMERIC-A	BOOLEAN-A-NUMERIC-B
100	200

However, if I try to put the two into one query so that the output above is tacked on to the end of the first output, I get a syntax error. This is my attempt at combining the two:

SELECT 
  (
    SELECT 
      SUM("TINYINT-A") AS "First Column", 
      SUM("TINYINT-B") AS "Second Column", 
      SUM("NUMERIC-A") AS "Third Column", 
      SUM("NUMERIC-B") AS "Fourth Column"
    FROM 
      "Table-A"
  ), 
  (
    SELECT 
      SUM("NUMERIC-A") AS "BOOLEAN-A-NUMERIC-A", 
      SUM("NUMERIC-B") AS "BOOLEAN-A-NUMERIC-B"
    FROM 
      "Table-A" 
    WHERE 
      "BOOLEAN-A" = 1
  ) 
FROM 
  "Table-A"

I forgot which SO question I tried to derive the structure of the above from, but it clearly didn't work, so either I didn't understand it correctly, or I have left out a character somewhere.

I also attempted to take the two separate queries exactly as they are, and put a new line between them with just UNION . This results in an error stating that the given command is not a SELECT statement. I'm guessing because the two statements don't have the same output structure.

I'm not even sure if the commands are the same in Base, and whether things vary significantly enough between other databases such as MySQL. I'm sure they are, and that I'm probably just doing something comparable to attempting to execute Python using HTML tags/syntax or something.

Answer 1

I don't know libreoffice and use Postgres, but maybe it works the same way and you can get an idea of it.

Given:

CREATE TABLE Table_A (
TINYINT_A SMALLINT,
TINYINT_B SMALLINT,
NUMERIC_A NUMERIC,
NUMERIC_B NUMERIC,
BOOLEAN_A BOOLEAN,
BOOLEAN_B BOOLEAN
);

INSERT INTO Table_A (
    TINYINT_A,
    TINYINT_B,
    NUMERIC_A,
    NUMERIC_B,
    BOOLEAN_A,
    BOOLEAN_B
)
VALUES
    (1,2,100,200,true,false),
    (9,8,900,800,false,true);

in postgres it works with subqueries like this, although I'm sure, there are better solutions:

SELECT 
    SUM(TINYINT_A) AS "First Column", 
    SUM(TINYINT_B) AS "Second Column", 
    SUM(NUMERIC_A) AS "Third Column", 
    SUM(NUMERIC_B) AS "Fourth Column",
    (SELECT SUM(NUMERIC_A) FROM Table_A WHERE BOOLEAN_A is true) AS BOOLEAN_A_NUMERIC_A,
    (SELECT SUM(NUMERIC_B) FROM Table_A WHERE BOOLEAN_A is true) AS BOOLEAN_A_NUMERIC_B
FROM Table_A