I have a table that looks like this in a MySQL database: I would like to select all lines where the Batch_Num is different from the previous value including the first one: Is there a keyword maybe to access the previous line to compare the to the current line? Or some other way to compare a line to the line
Tag: select
What happens when a comma is not placed following an existing field name in SQL
This is with regard to the SQL Tryit Editor provided by W3 Schools. (Saying this just in case it is an environment-specific problem) The code SELECT CustomerName, Address, City, PostalCode FROM …
When inserting multiple record into a SQL table it does not follow the order
When using a single insert statement to add multiple records into a table as shown below, it does not follow the same order when selecting. I understand that it does not affect anything but may I know …
Select max date per year
I have the table as follows: And I’d like to select the max date for every year per user, so the result would be like: Some help? Thank you! Answer Just use aggregation: If you have more columns that you want, then use distinct on:
SQL: Change the value of a column in function of another
I get a table from SQL that I put whitin a winform’s datagridview. I just want to change the value of my last column in funtion of another. Here is the example: I have 4 columns : ID / Price / …
using case statement in a where clause
Hello I am missing something because my code errors. select * from ##ScheduleDetail SD left join ##HolidayFilterTbl HF on SD.Scheduledate = HF.Testdate where (ScheduleDate = testdate) and (Case …
How to group by month and year?
I have a table PURCHASE with a date column PURCHASEDATE which is in DATE format. I’m trying to get the purchases grouped by month and year. To do so, I try with: I have also tryied with GROUP BY EXTRACT(MONTH FROM PURCHASEDATE), EXTRACT(YEAR FROM PURCHASEDATE) but neither worked. I’m rusty with SQL querys :S. EDIT Table cloumns Thanks ahead! Answer
Many conditions depends on IF clause within WHERE clause
How can I implement a WHERE clause that depends on one @value condition, like that pseudocode below: Answer As you’ve seen you can’t use an if like that, but you can create the desired behavior using the and and or logical operators:
How can I override rows from another table?
I have two tables: TableA ID Name — —- 1 aaa 2 bbb 3 ccc 4 ddd TableB ID Name — ——– 3 WWXXYYZZ I want to select from both tables, but skip the rows which exist in TableB. The …
Oracle SQL – ORA-00936: missing expression
whats wrong about this code ? I am trying to display all data on Employee_ID & Salary column, nothing else. what am I doing wrong here ? Answer Is this what you want?