Need Help With Basics of SQL

Hey I'm trying to get a working understanding of some of the basics behind SQL, I've composed a few questions that I think may help me with this. Anyone that can help me with any of them will greatly help me thanks.
1. How to create synonym for tables?
2. How to describe the structure of tables?
3. How to list the contents of tables?
4. How to create a table named with the same structure as another table?
5. How to copy rows with less than a certain criteria in value (e.g. Price<$5.00) into another table?
6. How to change the data type to e.g. NUMBER(6)?
7. How to add a new column named with data type e.g. VARCHAR2(10)?
8. How to change a specific field within a table (e.g. For ORDER_NUMBER 12489, change the C_NUMBER to 315)?
9. How to delete a specific row from a table?
10. How to declare a column as the primary key of a table and call it e.g. PK_something?
11. How to show certain columns when another column is less than a certain criteria in value (e.g. Price<$5.00)?
12. How to show certain columns with another column having a certain item class e.g. HW or AP?
13. How to list certain columns when another column e.g. price is between two values?
14. How to list certain columns when another column e.g. price is negative?
15. How to use the IN operator to find certain columns (e.g. first and last name of customers who are serviced by a certain ID)
16. How to find certain columns when one of the columns begins with a particular letter (e.g. A)
18. How to list the contents of the a table sorted in ascending order of item class and, within each item class, sorted in descending order of e.g. price?
19. How to do a count of column in a table?
20. How to sum a column and make rename is something?
21. How to do a count of a column in a table (without repeats e.g. if a certain number repeats more than once than to only count it once)?
22. How to use a subquery to find certain fields in columns when the another column’s fields values are greater than e.g. its average price?

848290 wrote:
Hey I'm trying to get a working understanding of some of the basics behind SQL, I've composed a few questions that I think may help me with this. Anyone that can help me with any of them will greatly help me thanks.To use the terminology you have in those questions, you must already have a basic understanding of SQL, so you have exposed yourself as not being the author of such questions.
Please do not ask homework questions without having at least attempted to answer them yourself first and show where you're struggling.

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  • Need help with min max sql

    hi all, forgot i had a user name and password and haven't needed help for quite a bit since i didn't do sql for a while but now i'm back at reporting again...
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    A     20100926     0     5     500     10
    A     20100926     600     10     500     30
    A     20100926     1500     12     100     30
    B     20100926     1800     28     200     40
    B     20100926     2200     6     150     70
    B     20100926     2600     15     600     60
    B     20100926     3600     30     200     70
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    Item     Date     Time     Total Duration          
    A     20100926     0     1600:20     --basically max (time+duration) - min(time+duration)     
    B     20100926     1800     2000:00
    Sorry, but. I didnt put my sql statement as I wasn't planning on posting and left it at work, but, i've been looking on internet and people say to use min/max function and i've attenpted it with it works with just this table (without grouping). But as soon as i group it the values seem to mess up.
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    A     20100926     0     1600:30     --basically max(time+duration) - min(time+duration)     
    B     20100926     1800     2000:70
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    Edited by: stanleyho on Sep 30, 2010 4:44 PM

    Okay, here we go again, repost, hopefully okay this time:
    Hi Madhu, okay, just got to work: I am using TOAD and working in Oracle 10g. Here is my table structure and the query i use to try and get what I am looking for:
    There is one extra table but that is only used to link these two tables listed below so i didn't bother posting it.
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    ColumnName ColID DataType Null
    CHANNEL_CODE 3 VARCHAR2 (4 Char) N
    DURATION 8 NUMBER (10) N
    DURATION_FRAME 9 NUMBER (2) N
    REAL_TIME 6 NUMBER (10) N
    REAL_TIME_FRAME 7 NUMBER (2) N
    ITEM_ID 4 NUMBER Y
    TX_DATE 2 CHAR (8 Byte) N
    TX_ID 1 NUMBER (9) N
    TX_TYPE 13 VARCHAR2 (4 Char) N
    TABLE: TX_SCHEDULE
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    TX_DATE 2 N CHAR (8 Byte)
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    SCHEDULE_TIME 8 N NUMBER (10)
    REAL_TIME 10 N NUMBER (10)
    DURATION_FRAME 13 N NUMBER (2)
    DURATION 12 N NUMBER (10)________________________________________
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    1651000 20100710 0 0 545 20 1234 00:00:00:00 00:09:05:20 00:00:00:00 00:09:05:20 0 0 545 20
    1752223 20100710 667 12 281 7 1234 00:11:07:12 00:04:41:07 00:11:07:10 00:04:41:07 667 10 281 7
    1846501 20100710 1071 13 335 9 1234 00:17:51:13 00:05:35:09 00:17:50:09 00:05:35:09 1070 9 335 9
    2001102 20100710 1525 6 249 14 1234 00:25:25:06 00:04:09:14 00:25:22:08 00:04:09:14 1522 8 249 14
    3246669 20100710 1800 0 586 2 1235 00:30:00:00 00:09:46:02 00:30:00:00 00:09:46:02 1800 0 586 2
    4456822 20100710 2492 16 276 5 1235 00:41:32:16 00:04:36:05 00:41:32:16 00:04:36:05 2492 16 276 5
    1253168 20100710 2890 15 222 17 1235 00:48:10:15 00:03:42:17 00:48:10:15 00:03:42:17 2890 15 222 17
    1112456 20100710 3277 18 297 0 1235 00:54:37:18 00:04:57:00 00:54:35:10 00:04:57:00 3275 10 297 0
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    TX_DATE ITEM_ID AS RUN TIME AS RUN DURATION SCHEDULED TIME SCHEDULED DURATION
    20100710 1234 00:00:00:00 00:29:34:20 00:00:00:00 00:29:31:20
    20100710 1235 00:30:00:00 00:29:34:17 00:30:00:00 00:29:32:17
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    20100710 1234 00:00:00:00 00:29:34:20 00:00:00:00 00:29:31:22
    20100710 1235 00:30:00:00 00:29:34:18 00:30:00:00 00:29:34:10________________________________________
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    TO_CHAR(TRUNC((MIN(TXR.REAL_TIME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) )/3600),'FM00')||':'||TO_CHAR(TRUNC(MOD(MIN(TXR.REAL_TIME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) ,3600)/60),'FM00')||':'||TO_CHAR(MOD(MIN(TXR.REAL_TIME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) ,60),'FM00')||':'||TO_CHAR(MOD(MIN(TXR.REAL_TIME_FRAME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) ,60),'FM00') "AS RUN TIME",
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    TO_CHAR(TRUNC((MIN(TXS.SCHEDULE_TIME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) )/3600),'FM00')||':'||TO_CHAR(TRUNC(MOD(MIN(TXS.SCHEDULE_TIME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) ,3600)/60),'FM00')||':'||TO_CHAR(MOD(MIN(TXS.SCHEDULE_TIME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) ,60),'FM00')||':'||TO_CHAR(MOD(MIN(TXS.SCHEDULE_TIME_FRAME) KEEP (DENSE_RANK FIRST ORDER BY TXR.REAL_TIME) ,60),'FM00') "SCHEDULED TIME",
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                

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    Linda Rathgeber [PVII] *Adobe Community Expert-Fireworks*
    http://www.projectseven.com
    Fireworks Newsgroup:
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    CSS Newsgroup: news://forums.projectseven.com/css/
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