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DROP TABLE IF EXISTS t3; CREATE TABLE t3(c1 TINYINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MAX(c1) AS value FROM t3; value 16 SELECT MAX(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 16 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -4 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 SMALLINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MAX(c1) AS value FROM t3; value 16 SELECT MAX(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 16 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -4 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 MEDIUMINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MAX(c1) AS value FROM t3; value 16 SELECT MAX(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 16 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -4 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MAX(c1) AS value FROM t3; value 16 SELECT MAX(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 16 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -4 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INTEGER NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MAX(c1) AS value FROM t3; value 16 SELECT MAX(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 16 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -4 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 BIGINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MAX(c1) AS value FROM t3; value 16 SELECT MAX(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 16 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -4 SELECT MAX(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 TINYINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MIN(c1) AS value FROM t3; value -9 SELECT MIN(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 1 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -9 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 SMALLINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MIN(c1) AS value FROM t3; value -9 SELECT MIN(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 1 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -9 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 MEDIUMINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MIN(c1) AS value FROM t3; value -9 SELECT MIN(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 1 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -9 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MIN(c1) AS value FROM t3; value -9 SELECT MIN(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 1 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -9 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INTEGER NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MIN(c1) AS value FROM t3; value -9 SELECT MIN(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 1 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -9 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 BIGINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT MIN(c1) AS value FROM t3; value -9 SELECT MIN(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 1 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -9 SELECT MIN(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 TINYINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT AVG(c1) AS value FROM t3; value 0.8000 SELECT AVG(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 8.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -6.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 SMALLINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT AVG(c1) AS value FROM t3; value 0.8000 SELECT AVG(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 8.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -6.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 MEDIUMINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT AVG(c1) AS value FROM t3; value 0.8000 SELECT AVG(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 8.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -6.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT AVG(c1) AS value FROM t3; value 0.8000 SELECT AVG(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 8.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -6.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INTEGER NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT AVG(c1) AS value FROM t3; value 0.8000 SELECT AVG(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 8.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -6.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 BIGINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT AVG(c1) AS value FROM t3; value 0.8000 SELECT AVG(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 8.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -6.5000 SELECT AVG(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 TINYINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT SUM(c1) AS value FROM t3; value 4 SELECT SUM(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 17 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -13 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 SMALLINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT SUM(c1) AS value FROM t3; value 4 SELECT SUM(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 17 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -13 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 MEDIUMINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT SUM(c1) AS value FROM t3; value 4 SELECT SUM(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 17 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -13 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT SUM(c1) AS value FROM t3; value 4 SELECT SUM(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 17 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -13 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 INTEGER NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT SUM(c1) AS value FROM t3; value 4 SELECT SUM(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 17 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -13 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 BIGINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT SUM(c1) AS value FROM t3; value 4 SELECT SUM(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 17 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value -13 SELECT SUM(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value NULL DROP TABLE t3; CREATE TABLE t3(c1 TINYINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT COUNT(c1) AS value FROM t3; value 5 SELECT COUNT(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value 0 DROP TABLE t3; CREATE TABLE t3(c1 SMALLINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT COUNT(c1) AS value FROM t3; value 5 SELECT COUNT(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value 0 DROP TABLE t3; CREATE TABLE t3(c1 MEDIUMINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT COUNT(c1) AS value FROM t3; value 5 SELECT COUNT(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value 0 DROP TABLE t3; CREATE TABLE t3(c1 INT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT COUNT(c1) AS value FROM t3; value 5 SELECT COUNT(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value 0 DROP TABLE t3; CREATE TABLE t3(c1 INTEGER NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT COUNT(c1) AS value FROM t3; value 5 SELECT COUNT(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value 0 DROP TABLE t3; CREATE TABLE t3(c1 BIGINT NULL); INSERT INTO t3 (c1) VALUES(0); INSERT INTO t3 (c1) VALUES(1); INSERT INTO t3 (c1) VALUES(16); INSERT INTO t3 (c1) VALUES(-4); INSERT INTO t3 (c1) VALUES(-9); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); INSERT INTO t3 (c1) VALUES(NULL); SELECT COUNT(c1) AS value FROM t3; value 5 SELECT COUNT(c1) AS postive_value FROM t3 WHERE c1 > 0; postive_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 < 0; negative_value 2 SELECT COUNT(c1) AS negative_value FROM t3 WHERE c1 = 2; negative_value 0 DROP TABLE t3;