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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact ba35d6611e8bfe526a89355da39dde482d4ecd41:


# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing aggregate functions and the
# GROUP BY and HAVING clauses of SELECT statements.
#
# $Id: select3.test,v 1.7 2002/12/03 02:34:50 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Build some test data
#
do_test select3-1.0 {
  set fd [open data1.txt w]
  for {set i 1} {$i<32} {incr i} {
    for {set j 0} {pow(2,$j)<$i} {incr j} {}
    puts $fd "$i\t$j"
  }
  close $fd
  execsql {
    CREATE TABLE t1(n int, log int);
    COPY t1 FROM 'data1.txt'
  }
  file delete data1.txt
  execsql {SELECT DISTINCT log FROM t1 ORDER BY log}
} {0 1 2 3 4 5}

# Basic aggregate functions.
#
do_test select3-1.1 {
  execsql {SELECT count(*) FROM t1}
} {31}
do_test select3-1.2 {
  execsql {
    SELECT min(n),min(log),max(n),max(log),sum(n),sum(log),avg(n),avg(log)
    FROM t1
  }
} {1 0 31 5 496 124 16 4}
do_test select3-1.3 {
  execsql {SELECT max(n)/avg(n), max(log)/avg(log) FROM t1}
} {1.9375 1.25}

# Try some basic GROUP BY clauses
#
do_test select3-2.1 {
  execsql {SELECT log, count(*) FROM t1 GROUP BY log ORDER BY log}
} {0 1 1 1 2 2 3 4 4 8 5 15}
do_test select3-2.2 {
  execsql {SELECT log, min(n) FROM t1 GROUP BY log ORDER BY log}
} {0 1 1 2 2 3 3 5 4 9 5 17}
do_test select3-2.3 {
  execsql {SELECT log, avg(n) FROM t1 GROUP BY log ORDER BY log}
} {0 1 1 2 2 3.5 3 6.5 4 12.5 5 24}
do_test select3-2.3 {
  execsql {SELECT log, avg(n)+1 FROM t1 GROUP BY log ORDER BY log}
} {0 2 1 3 2 4.5 3 7.5 4 13.5 5 25}
do_test select3-2.4 {
  execsql {SELECT log, avg(n)-min(n) FROM t1 GROUP BY log ORDER BY log}
} {0 0 1 0 2 0.5 3 1.5 4 3.5 5 7}
do_test select3-2.5 {
  execsql {SELECT log*2+1, avg(n)-min(n) FROM t1 GROUP BY log ORDER BY log}
} {1 0 3 0 5 0.5 7 1.5 9 3.5 11 7}
do_test select3-2.6 {
  execsql {
    SELECT log*2+1 as x, count(*) FROM t1 GROUP BY x ORDER BY x
  }
} {1 1 3 1 5 2 7 4 9 8 11 15}
do_test select3-2.7 {
  execsql {
    SELECT log*2+1 AS x, count(*) AS y FROM t1 GROUP BY x ORDER BY y
  }
} {1 1 3 1 5 2 7 4 9 8 11 15}
do_test select3-2.8 {
  execsql {
    SELECT log*2+1 AS x, count(*) AS y FROM t1 GROUP BY x ORDER BY 10-(x+y)
  }
} {11 15 9 8 7 4 5 2 3 1 1 1}
do_test select3-2.9 {
  catchsql {
    SELECT log, count(*) FROM t1 GROUP BY 8 ORDER BY log;
  }
} {1 {GROUP BY expressions should not be constant}}

# Cannot have a HAVING without a GROUP BY
#
do_test select3-3.1 {
  set v [catch {execsql {SELECT log, count(*) FROM t1 HAVING log>=4}} msg]
  lappend v $msg
} {1 {a GROUP BY clause is required before HAVING}}

# Toss in some HAVING clauses
#
do_test select3-4.1 {
  execsql {SELECT log, count(*) FROM t1 GROUP BY log HAVING log>=4 ORDER BY log}
} {4 8 5 15}
do_test select3-4.2 {
  execsql {
    SELECT log, count(*) FROM t1 
    GROUP BY log 
    HAVING count(*)>=4 
    ORDER BY log
  }
} {3 4 4 8 5 15}
do_test select3-4.3 {
  execsql {
    SELECT log, count(*) FROM t1 
    GROUP BY log 
    HAVING count(*)>=4 
    ORDER BY max(n)
  }
} {3 4 4 8 5 15}
do_test select3-4.4 {
  execsql {
    SELECT log AS x, count(*) AS y FROM t1 
    GROUP BY x
    HAVING y>=4 
    ORDER BY max(n)
  }
} {3 4 4 8 5 15}
do_test select3-4.5 {
  execsql {
    SELECT log AS x FROM t1 
    GROUP BY x
    HAVING count(*)>=4 
    ORDER BY max(n)
  }
} {3 4 5}

do_test select3-5.1 {
  execsql {
    SELECT log, count(*), avg(n), max(n+log*2) FROM t1 
    GROUP BY log 
    ORDER BY max(n+log*2), avg(n)
  }
} {0 1 1 1 1 1 2 4 2 2 3.5 8 3 4 6.5 14 4 8 12.5 24 5 15 24 41}
do_test select3-5.2 {
  execsql {
    SELECT log, count(*), avg(n), max(n+log*2) FROM t1 
    GROUP BY log 
    ORDER BY max(n+log*2), min(log,avg(n))
  }
} {0 1 1 1 1 1 2 4 2 2 3.5 8 3 4 6.5 14 4 8 12.5 24 5 15 24 41}

# Test sorting of GROUP BY results in the presence of an index
# on the GROUP BY column.
#
do_test select3-6.1 {
  execsql {
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY log;
  }
} {0 1 1 2 2 3 3 5 4 9 5 17}
do_test select3-6.2 {
  execsql {
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY log DESC;
  }
} {5 17 4 9 3 5 2 3 1 2 0 1}
do_test select3-6.3 {
  execsql {
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY 1;
  }
} {0 1 1 2 2 3 3 5 4 9 5 17}
do_test select3-6.4 {
  execsql {
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY 1 DESC;
  }
} {5 17 4 9 3 5 2 3 1 2 0 1}
do_test select3-6.5 {
  execsql {
    CREATE INDEX i1 ON t1(log);
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY log;
  }
} {0 1 1 2 2 3 3 5 4 9 5 17}
do_test select3-6.6 {
  execsql {
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY log DESC;
  }
} {5 17 4 9 3 5 2 3 1 2 0 1}
do_test select3-6.7 {
  execsql {
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY 1;
  }
} {0 1 1 2 2 3 3 5 4 9 5 17}
do_test select3-6.8 {
  execsql {
    SELECT log, min(n) FROM t1 GROUP BY log ORDER BY 1 DESC;
  }
} {5 17 4 9 3 5 2 3 1 2 0 1}



finish_test