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Join Of 2 Tables

21 New Member

I have 2 tables.

table1 has all dates from DAY1 - DAY7


Table2 has effort entry and a date entry like this
DAY3 4

Now i need a SQL that will JOIN these 2 tables and produce the output as

DAY1 0
DAY2 0
DAY3 4
DAY4 0
DAY5 0
DAY6 0
DAY7 0

So if no days exist in table2 the value field should be filled with 0.
Dec 8 '06 #1
3 1476
4,258 Recognized Expert Specialist
Using a left JOIN will give the result, where the columns of table2 that are not in table1 will be NULL.
Expand|Select|Wrap|Line Numbers
  1. SELECT * FROM table1 LEFT JOIN table2 USING (col1)
produces result:
Expand|Select|Wrap|Line Numbers
  1. +------+------+
  2. | col1 | col2 |
  3. +------+------+
  4. |    1 | NULL |
  5. |    2 | NULL |
  6. |    3 |    4 |
  7. |    4 | NULL |
  8. |    5 | NULL |
  9. |    6 | NULL |
  10. |    7 | NULL |
  11. +------+------+
Ronald :cool:
Dec 8 '06 #2
1 New Member
Hi !

Can you help me out . I have a table with set of columns, one of the column is createdon . Now i need to compare createdon column with sysdate. if it is less than sysdate i need to fetch all columns and display.
my createdon is created in database as datetime in mysql .can u give me a query to compare created on and system date.
Dec 25 '06 #3
4,258 Recognized Expert Specialist
Hi !

Can you help me out . I have a table with set of columns, one of the column is createdon . Now i need to compare createdon column with sysdate. if it is less than sysdate i need to fetch all columns and display.
my createdon is created in database as datetime in mysql .can u give me a query to compare created on and system date.
This question has nothing to do with the title of this thread. So members who lookup thsi forum, based on the thread title, will not see your post. Please open a new thread if you have a new question that has no relation to the title.

For now the statement is:
Expand|Select|Wrap|Line Numbers
  1. SELECT * FROM table WHERE createdon < CURRENT_DATE;
Ronald :cool:
Dec 25 '06 #4

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