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EXPLAIN SELECT COUNT(*) FROM tmp_sample_genotype_single_bp; | |
+----+-------------+-------+------+---------------+------+---------+------+------+------------------------------+ | |
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | | |
+----+-------------+-------+------+---------------+------+---------+------+------+------------------------------+ | |
| 1 | SIMPLE | NULL | NULL | NULL | NULL | NULL | NULL | NULL | Select tables optimized away | | |
+----+-------------+-------+------+---------------+------+---------+------+------+------------------------------+ | |
1 row in set (0.00 sec) | |
EXPLAIN SELECT COUNT(DISTINCT variation_id) FROM tmp_sample_genotype_single_bp; | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+------+----------+--------------------------+ | |
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+------+----------+--------------------------+ | |
| 1 | SIMPLE | tmp_sample_genotype_single_bp | range | variation_idx | variation_idx | 4 | NULL | 69386320 | Using index for group-by | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+------+----------+--------------------------+ | |
1 row in set (0.00 sec) | |
EXPLAIN SELECT COUNT(DISTINCT variation_id), COUNT(*) FROM tmp_sample_genotype_single_bp; | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+------+-----------+-------------+ | |
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+------+-----------+-------------+ | |
| 1 | SIMPLE | tmp_sample_genotype_single_bp | index | NULL | variation_idx | 4 | NULL | 277545278 | Using index | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+------+-----------+-------------+ | |
1 row in set (0.00 sec) | |
EXPLAIN SELECT COUNT(*) FROM tmp_sample_genotype_single_bp INNER JOIN variation USING (variation_id); | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
| 1 | SIMPLE | variation | index | PRIMARY | PRIMARY | 4 | NULL | 71156260 | Using index | | |
| 1 | SIMPLE | tmp_sample_genotype_single_bp | ref | variation_idx | variation_idx | 4 | solanum_lycopersicum_variation_41_94_250.variation.variation_id | 4 | Using where; Using index | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
2 rows in set (0.00 sec) | |
EXPLAIN SELECT COUNT(DISTINCT variation_id) FROM tmp_sample_genotype_single_bp INNER JOIN variation USING (variation_id); | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
| 1 | SIMPLE | variation | index | PRIMARY | PRIMARY | 4 | NULL | 71156260 | Using index | | |
| 1 | SIMPLE | tmp_sample_genotype_single_bp | ref | variation_idx | variation_idx | 4 | solanum_lycopersicum_variation_41_94_250.variation.variation_id | 4 | Using where; Using index | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
2 rows in set (0.00 sec) | |
EXPLAIN SELECT COUNT(*), COUNT(DISTINCT variation_id) FROM tmp_sample_genotype_single_bp INNER JOIN variation USING (variation_id); | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
| 1 | SIMPLE | variation | index | PRIMARY | PRIMARY | 4 | NULL | 71156260 | Using index | | |
| 1 | SIMPLE | tmp_sample_genotype_single_bp | ref | variation_idx | variation_idx | 4 | solanum_lycopersicum_variation_41_94_250.variation.variation_id | 4 | Using where; Using index | | |
+----+-------------+-------------------------------+-------+---------------+---------------+---------+-----------------------------------------------------------------+----------+--------------------------+ | |
2 rows in set (0.00 sec) |
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