SQL supports qualifying a column by prefixing the reference with either the full table name: …or a table alias: The table alias is the recommended approach — why type more than you have to? Why Do These Queries Look Different? Secondly, my answers use ANSI-92 JOIN syntax (yours is ANSI-89). While they perform the same, … Read more
If you are a newbie, I think you should learn how to use git. You can refer the link below: https://education.github.com/git-cheat-sheet-education.pdf Basic steps: Clone or download source code from Github. You can download it directly, or use a tool like Git-bash, tortoise git… Run this source code, depending on the language of the source code.
his expression 12-4-2005 is a calculated int and the value is -1997. You should do like this instead ‘2005-04-12’ with the ‘ before and after.
Effectively, the IN statement creates a series of OR statements… so Is effectively And sadly, that is the route you’ll have to take with your LIKE statements
A query’s projection can only have one instance of a given name. As your WHERE clause shows, you have several tables with a column called ID. Because you are selecting * your projection will have several columns called ID. Or it would have were it not for the compiler hurling ORA-00918. The solution is quite simple: you … Read more
It’s true that if your primary key is just a identity value auto incremented, you would have no real use for ON UPDATE CASCADE. However, let’s say that your primary key is a 10 digit UPC bar code and because of expansion, you need to change it to a 13-digit UPC bar code. In that … Read more
Easy: or if you just want one row:
I have a table like: Not exactly like above but similar to that…. Now assume that my table has 200000 rows and now I want to remove partitions on the table and reorganize them in accordance to requirement without MAX VALUE in it. Can any one help me to rearrange partition without dropping data or … Read more
A query’s projection can only have one instance of a given name. As your WHERE clause shows, you have several tables with a column called ID. Because you are selecting * your projection will have several columns called ID. Or it would have were it not for the compiler hurling ORA-00918. The solution is quite simple: you … Read more
I can think of at least two options… Or… Both let you have multiple different sets of constants. One is expandable without changing the schema, though the query still would need to change. The main advantage of either approach is that you can re-use the constants else where, but store them once in a centralised … Read more