How to drop multiple tables from one single database at one command. something like, > use test; > drop table a,b,c; where a,b,c are the tables from database test.
Tag: sql
Two Inner Joins MYSQL
How would I preform two inner joins in one query? Ie: three tables Invoice Address Client Invoice has a column which references an id in clients. It also has a column which references an address. I need to get both the clients name from the matched table and the address from the matched table. How would I INN…
How do I find the largest value in a column in postgres sql?
For example: name | weight jon 100 jane 120 joe 130 How do I only return the name of the person with the largest weight?
How to sort Varchar Date in SQL Server 2000
My table schema (table Name Stock) Field Date Datetime If Date having datatype is Datetime then SQL Server sorts the date in well/perfect order. See Below Example. select date from stock order by …
Problem with the value portion of a drop down menu in ColdFusion
Here is what I have inside of my select statement: Everything works fine, but the value it passes to my URL filter is #CountryName#, not the actual country name (i.e. Canada). How can I assign it the value of the country name and not the variable name? Answer The #CountryName# variable is not being evaluated …
SQL Server VARBINARY(max) to c# byte[]
I am querying the table (one of the columns is a VARBINARY(MAX)) which returns some records. Then I save that as .dat.csv then I parse through that .dat file and get that varbinary value into a string by splitting the file based on commas. Now I need to convert this varbinary to byte array. How can I do that?…
How to Implement Referential Integrity in Subtypes
I have the following tables in a relational database: Basically, ReadingSwitch and ReadingValue are subtypes of Reading and SwitchSensor and AnalogSensor are subtypes of Sensor. A reading can either be a SwitchReading or ValueReading value – it cannot be both, and a Sensor can either be an AnalogSensor …
T-SQL: Using a CASE in an UPDATE statement to update certain columns depending on a condition
I am wondering if this is possible at all. I want to update column x if a condition is true, otherwise column y would be updated I have searched all over, tried out some things and am unable to find a solution. I think it’s not possible, but I thought I would ask here and see if anyone has done
How to use money data type in Java, SQL, ORM
What are best practises in using money data type in Java application? Money should be in double variable? What about rounding, currencies and so on. Are special libraries for this? And what about ORM and SQL in most popular databases. As I know not in all SQL engines is Money data type. In that case NUMERIC(1…
Conditional NOT NULL case SQL
I am trying to calculate a field and I want it to behave differently depending on if one of the columns happens to be null. I am using MySQL Is this the right syntax? Answer You need to have when reply.replies IS NOT NULL NULL is a special case in SQL and cannot be compared with = or <> operators.