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1 PRIMARY t2 ALL DDOCTYPEID_IDX NULL NULL NULL 9 Using where
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1 PRIMARY t1 eq_ref PRIMARY PRIMARY 34 test.t2.DOCID 1
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1 PRIMARY t4 eq_ref PRIMARY PRIMARY 34 test.t2.DOCTYPEID 1
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2 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using index; Using where
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3 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using index; Using where
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4 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using index; Using where
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5 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using index; Using where
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6 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX PRIMARY 34 func 1 Using index; Using where
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2 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using where
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3 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using where
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4 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using where
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5 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX PRIMARY 34 func 1 Using where
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6 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY,FFOLDERID_IDX,CMFLDRPARNT_IDX PRIMARY 34 func 1 Using where
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drop table t1, t2, t3, t4;
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CREATE TABLE t1 (a int(10) , PRIMARY KEY (a)) Engine=InnoDB;
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INSERT INTO t1 VALUES (1),(2);