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id
NULL
-1
0
1
2
3
4
5
6
7
8
9
10
id facility
NULL NULL
-1
0
1 /L
2 A01
3 ANC
4 F01
5 FBX
6 MT
7 P
8 RV
9 SRV
10 VMT
id-5 facility
NULL NULL
-6
-5
-4 /L
-3 A01
-2 ANC
-1 F01
0 FBX
1 MT
2 P
3 RV
4 SRV
5 VMT
id concat(facility)
NULL NULL
-1
0
1 /L
2 A01
3 ANC
4 F01
5 FBX
6 MT
7 P
8 RV
9 SRV
10 VMT
a max(id) b
10 10 VMT
9 9 SRV
8 8 RV
7 7 P
6 6 MT
5 5 FBX
4 4 F01
3 3 ANC
2 2 A01
1 1 /L
-1 -1
0 0
NULL NULL NULL
grp count(*)
0 7
1 6
FACILITY
NULL
/L
A01
ANC
F01
FBX
MT
P
RV
SRV
VMT
FACILITY
NULL
/L
A01
ANC
F01
FBX
MT
P
RV
SRV
VMT
count(*)
12
count(facility)
12
count(*)
13
count(*)
1
count(*)
0
count(*)
12
count(*)
1
count(*)
12
UserId
UserId
UserId
UserId
b
1
table type possible_keys key key_len ref rows Extra
t3 index a a 5 NULL 6 Using index; Using temporary
t2 index a a 4 NULL 5 Using index; Distinct
t1 eq_ref PRIMARY PRIMARY 4 t2.a 1 where used; Distinct
a
1
table type possible_keys key key_len ref rows Extra
t1 index PRIMARY PRIMARY 4 NULL 2 Using index; Using temporary
t3 ref a a 5 t1.a 10 Using index; Distinct
a
1
2
1
1
name
aa
ab
name
aa
ab
1
1
key_link_id link
NULL NULL
table type possible_keys key key_len ref rows Extra
t1 index id id 4 NULL 2 Using index; Using temporary
t2 index id id 8 NULL 1 Using index; Distinct
t3 index id id 8 NULL 1 Using index; Distinct
j_lj_t2 index id id 4 NULL 2 where used; Using index; Distinct
t2_lj index id id 8 NULL 1 where used; Using index; Distinct
j_lj_t3 index id id 4 NULL 2 where used; Using index; Distinct
t3_lj index id id 8 NULL 1 where used; Using index; Distinct
id
2
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
1 00:36:30
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
1 00:36:30
a sec_to_time(sum(time_to_sec(t)))
1 00:06:15
1 00:36:30
a
4
3
a c
4 NULL
3 NULL
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