Re: What are schemas? - Mailing list pgsql-novice

Francisco Reyes wrote:

> Saw some recent discussions about schemas (hacker email sent to another
> list I read).
>
> What are schemas?
> I have a general/vague idea, but would like to better understand it.

I have created a schema for my electroplating jobshop.  "Fundamentals of
Database Systems" by Elmasri and Navathe was used as reference. The diagram
is in xfig.  If you find that interesting, and would like to get details, I
would be glad to write a note about it. It will be a bit long. "Beginning
Databases with PostgreSQL" by Stones and Mathews also gives  information on
schema.

Vijay
#FIG 3.2
Landscape
Center
Inches
A4
100.00
Single
-2
1200 2
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 772 2700 337 150 435 2550 1110 2850
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 532 2017 427 142 105 1875 960 2160
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 493 1698 345 135 148 1563 838 1833
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 504 1353 360 150 144 1203 864 1503
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1475 1693 300 120 1175 1573 1775 1813
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1395 2325 195 120 1200 2205 1590 2445
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1139 1010 307 112 832 898 1447 1123
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 2077 1354 442 127 1635 1227 2520 1482
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1470 720 315 135 1155 585 1785 855
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 2316 703 285 105 2031 598 2601 808
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 2662 1057 307 142 2355 915 2970 1200
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 3105 750 210 105 2895 645 3315 855
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 3382 1057 247 112 3135 945 3630 1170
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 3412 1395 202 90 3210 1305 3615 1485
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 3900 1672 480 142 3420 1530 4380 1815
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 3757 742 262 127 3495 615 4020 870
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 4185 1005 315 120 3870 885 4500 1125
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 4560 1297 360 127 4200 1170 4920 1425
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 5767 1905 247 135 5520 1770 6015 2040
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 5985 1590 345 150 5640 1440 6330 1740
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 6277 1290 232 120 6045 1170 6510 1410
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 6495 855 285 120 6210 735 6780 975
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 7110 825 300 135 6810 690 7410 960
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1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 7612 1455 277 120 7335 1335 7890 1575
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 7785 1747 180 97 7605 1650 7965 1845
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 9525 1687 600 187 8925 1500 10125 1875
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 9907 1230 382 105 9525 1125 10290 1335
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 10065 862 240 97 9825 765 10305 960
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 10260 600 195 120 10065 480 10455 720
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 10770 930 300 150 10470 780 11070 1080
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11152 1290 262 135 10890 1155 11415 1425
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 10965 4492 285 142 10680 4350 11250 4635
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11647 4777 307 112 11340 4665 11955 4890
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11572 5077 217 97 11355 4980 11790 5175
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11512 5392 232 97 11280 5295 11745 5490
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 10987 7350 337 150 10650 7200 11325 7500
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11557 6982 262 112 11295 6870 11820 7095
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11782 7297 262 127 11520 7170 12045 7425
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11767 7590 187 105 11580 7485 11955 7695
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11805 7897 210 97 11595 7800 12015 7995
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11842 8190 262 120 11580 8070 12105 8310
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 11437 8400 262 120 11175 8280 11700 8520
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1350 3997 225 157 1125 3840 1575 4155
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 787 3997 277 127 510 3870 1065 4125
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 435 4275 300 105 135 4170 735 4380
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 442 4590 277 105 165 4485 720 4695
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 375 4890 285 120 90 4770 660 5010
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 2265 5145 720 180 1545 4965 2985 5325
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1567 5482 262 127 1305 5355 1830 5610
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1185 5797 435 142 750 5655 1620 5940
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 795 6157 195 127 600 6030 990 6285
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 1147 6480 397 150 750 6330 1545 6630
1 2 1 1 0 7 100 0 -1 4.000 1 0.0000 1552 6847 382 142 1170 6847 1934 6847
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 6870 7320 480 165 6390 7155 7350 7485
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 6007 7470 217 105 5790 7365 6225 7575
1 2 1 1 0 7 100 0 -1 4.000 1 0.0000 11677 5700 382 135 11295 5700 12059 5700
1 2 1 1 0 7 100 0 -1 4.000 1 0.0000 11602 4470 262 120 11340 4470 11864 4470
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1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 4417 6720 322 120 4095 6600 4740 6840
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 4515 7035 300 105 4215 6930 4815 7140
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1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 3082 8340 352 150 2730 8190 3435 8490
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 4387 8347 217 142 4170 8205 4605 8490
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 4762 7387 337 112 4425 7275 5100 7500
1 2 1 1 0 7 100 0 -1 4.000 1 0.0000 3780 8347 255 127 3525 8347 4035 8347
1 2 0 1 0 7 100 0 -1 0.000 1 0.0000 3052 7012 592 157 2460 6855 3645 7170
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 2 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 5
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 5
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
     8865 6855 7170 7650
2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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     2745 7815 3135 7815
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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2 1 0 1 0 7 100 0 -1 0.000 0 0 -1 0 0 2
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4 0 0 100 0 0 12 0.0000 4 180 585 255 2070 jobcode\001
4 0 0 100 0 0 12 0.0000 4 135 585 210 1770 returnid\001
4 0 0 100 0 0 12 0.0000 4 180 630 225 1410 jobname\001
4 0 0 100 0 0 12 0.0000 4 135 510 1230 1770 details\001
4 0 0 100 0 0 12 0.0000 4 135 270 1230 2385 clid\001
4 0 0 100 0 0 12 0.0000 4 135 750 1755 1410 undercoat\001
4 0 0 100 0 0 12 0.0000 4 180 495 2085 765 u2gms\001
4 0 0 100 0 0 12 0.0000 4 180 510 2430 1095 plating\001
4 0 0 100 0 0 12 0.0000 4 135 315 2955 795 gms\001
4 0 0 100 0 0 12 0.0000 4 135 375 3240 1125 units\001
4 0 0 100 0 0 12 0.0000 4 135 765 3495 1725 text descr\001
4 0 0 100 0 0 12 0.0000 4 105 300 3285 1455 rate\001
4 0 0 100 0 0 12 0.0000 4 135 435 3555 810 billstr\001
4 0 0 100 0 0 12 0.0000 4 180 525 3915 1065 helpstr\001
4 0 0 100 0 0 12 0.0000 4 180 615 4275 1350 descript\001
4 0 0 100 0 2 16 0.0000 4 195 450 2235 2310 JOB\001
4 0 0 100 0 2 16 0.0000 4 165 840 6300 2400 INMAT\001
4 0 0 100 0 0 12 0.0000 4 135 645 4275 2325 received\001
4 0 0 100 0 2 16 0.0000 4 165 1095 9900 2325 OUTMAT\001
4 0 0 100 0 0 12 0.0000 4 135 630 8100 2325 returned\001
4 0 0 100 0 0 12 0.0000 4 150 645 10050 3795 compute\001
4 0 0 100 0 2 16 0.0000 4 165 570 10275 5220 BILL\001
4 0 0 100 0 2 17 0.0000 4 165 915 945 4575 CLIENT\001
4 0 0 100 0 0 12 0.0000 4 180 495 5775 1650 jobkey\001
4 0 0 100 0 0 12 0.0000 4 135 270 6150 1350 clid\001
4 0 0 100 0 0 12 0.0000 4 135 405 6300 900 indoc\001
4 0 0 100 0 0 12 0.0000 4 135 465 6900 900 indate\001
4 0 0 100 0 0 12 0.0000 4 180 375 7200 1200 inqty\001
4 0 0 100 0 0 12 0.0000 4 105 390 7425 1500 ratex\001
4 0 0 100 0 0 12 0.0000 4 90 180 7725 1800 oc\001
4 0 0 100 0 2 12 0.0000 4 180 330 5625 1950 inky\001
4 0 0 100 0 2 12 0.0000 4 180 975 9075 1725 ourchln,inky\001
4 0 0 100 0 0 12 0.0000 4 135 570 9600 1275 outdate\001
4 0 0 100 0 0 12 0.0000 4 150 330 9900 900 oqty\001
4 0 0 100 0 0 12 0.0000 4 135 270 10125 675 clid\001
4 0 0 100 0 0 12 0.0000 4 180 495 10575 975 jobkey\001
4 0 0 100 0 0 12 0.0000 4 135 405 10950 1350 billno\001
4 0 0 100 0 2 12 0.0000 4 135 420 10770 4545 billno\001
4 0 0 100 0 0 12 0.0000 4 135 375 11415 4545 bamt\001
4 0 0 100 0 0 12 0.0000 4 135 420 11445 4860 bdate\001
4 0 0 100 0 0 12 0.0000 4 135 270 11430 5145 clid\001
4 0 0 100 0 0 12 0.0000 4 105 240 11385 5460 tax\001
4 0 0 100 0 0 12 0.0000 4 135 585 11385 5745 balance\001
4 0 0 100 0 2 16 0.0000 4 165 1050 10050 7875 RECEIPT\001
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4 0 0 100 0 0 12 0.0000 4 150 735 10200 6675   payment\001
4 0 0 100 0 0 12 0.0000 4 105 555 10725 7395 amount\001
4 0 0 100 0 0 12 0.0000 4 135 330 11400 7050 date\001
4 0 0 100 0 0 12 0.0000 4 135 270 11625 7650 clid\001
4 0 0 100 0 0 12 0.0000 4 135 360 11625 7950 cach\001
4 0 0 100 0 0 12 0.0000 4 180 450 11625 8250 chqno\001
4 0 0 100 0 0 12 0.0000 4 135 360 11250 8475 bank\001
4 0 0 100 0 2 12 0.0000 4 120 360 11625 7350 trnm\001
4 0 0 100 0 0 12 0.0000 4 150 330 8475 7650 post\001
4 0 0 100 0 0 12 0.0000 4 180 645 8175 7875   against\001
4 0 0 100 0 0 12 0.0000 4 135 540 8175 8100    billno\001
4 0 0 100 0 2 16 0.0000 4 165 1320 5925 7950 BILLTRNM\001
4 0 0 100 0 0 12 0.0000 4 90 405 1650 3150 owns\001
4 0 0 100 0 0 12 0.0000 4 180 225 1725 3450 job\001
4 0 0 100 0 0 12 0.0000 4 135 420 2700 3900 client\001
4 0 0 100 0 0 12 0.0000 4 180 615 2700 4350 job strip\001
4 0 0 100 0 2 16 0.0000 4 165 1215 2025 6075 RECSTRIP\001
4 0 0 100 0 0 12 0.0000 4 90 405 600 4050 name\001
4 0 0 100 0 0 12 0.0000 4 135 420 225 4350 addr1\001
4 0 0 100 0 0 12 0.0000 4 135 420 225 4650 addr2\001
4 0 0 100 0 0 12 0.0000 4 135 420 150 4950 addr3\001
4 0 0 100 0 2 12 0.0000 4 135 270 1200 4050 clid\001
4 0 0 100 0 2 12 0.0000 4 180 1275 1650 5175 ourchln,spoolno\001
4 0 0 100 0 0 12 0.0000 4 180 600 900 5850 spoolwt\001
4 0 0 100 0 0 12 0.0000 4 180 615 825 6525 stripped\001
4 0 0 100 0 0 12 0.0000 4 180 540 1275 6900 agused\001
4 0 0 100 0 0 12 0.0000 4 180 315 1425 5550 inky\001
4 0 0 100 0 0 12 0.0000 4 135 240 675 6225 iwt\001
4 0 0 100 0 0 12 0.0000 4 135 360 6720 5760 send\001
4 0 0 100 0 0 12 0.0000 4 180 1110 6390 6180 and "compute"\001
4 0 0 100 0 0 12 0.0000 4 135 1095 6390 5985 data to outmat\001
4 0 0 100 0 0 12 0.0000 4 135 510 8565 6105 reduce\001
4 0 0 100 0 0 12 0.0000 4 180 810 8400 6360 balance by\001
4 0 0 100 0 0 12 0.0000 4 135 660 8400 6585      "amt"\001
4 0 0 100 0 0 12 0.0000 4 105 510 5865 7530 amt     \001
4 0 0 100 0 2 12 0.0000 4 165 840 6480 7380 billno,trnm\001
4 0 0 100 0 0 12 0.0000 4 135 555 1620 7590  collate\001
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4 0 0 100 0 0 12 0.0000 4 135 1035 1290 8010        reference\001
4 0 0 100 0 2 16 0.0000 4 165 1170 3225 8025 LTTRANS\001
4 0 0 100 0 0 12 0.0000 4 150 480 3255 7410 agrate\001
4 0 0 100 0 0 12 0.0000 4 135 360 3540 6735 pono\001
4 0 0 100 0 0 12 0.0000 4 180 510 4155 6765 podate\001
4 0 0 100 0 0 12 0.0000 4 180 510 4245 7080 agdate\001
4 0 0 100 0 0 12 0.0000 4 135 525 4515 7440 remark\001
4 0 0 100 0 0 12 0.0000 4 180 1725 2835 8400 agused     eqcu      oqty\001
4 0 0 100 0 0 12 0.0000 4 135 360 2730 4140 L&T\001
4 0 0 100 0 2 12 0.0000 4 180 975 2565 7050 ourchln,inky\001
4 0 0 100 0 0 12 0.0000 4 135 510 900 1050 ucoat1\001
4 0 0 100 0 0 12 0.0000 4 180 495 1275 750 u1gms\001
4 0 0 100 0 0 12 0.0000 4 135 510 1665 510 ucoat2\001