conversion table chart

Label:1, before the project, the database was designed with PowerDesigner, because at the time of the design did not notice, the type of int did not give length When you build the database, Oracle defaults to the type that you generate, which is a large type of bigdecimal. I felt nothing at the time. In the background, the new one bigdecimal out and then it's saved. But then a colleague in the statistical data record, COUNT (*) Statistics is also bigdecimal this time with hibernate turn very tro

Horizontal Table Conversion Vertical table:CREATE Table score (username varchar (ten), Chinese int, math int, physics int); INSERT into score (username , Chinese, math, physics) VALUES (' Kay ', 74,83,93), INSERT into score (username, Chinese, math, physics) VALUES (' Jim ', 75, 84,94); INSERT into score (username, Chinese, math, physics) VALUES (' Lily ', 86,49,

converted to columns, and in that specifies which specific rows to convert, and with these we cannot understand the following SQL: SELECT *From (Selectmonth, prd_type_id, amountFrom All_saleswhereYear = 2003 and prd_type_id in (1,2,3)) pivot ( sum (amount) for (month, prd_type_i d) in ((1, 1) as Jan_prd_type_1, (2, 2) as Feb_prd_type_2, (3, 3) as Mar _prd_type_3, (4, 2) as apr_prd_type_2); Using multiple aggregate functions in a transformationSELECT *From (Selectmonth, prd_type_id, a