All columns in the SELECT clause that do not have an aggregate need to be in the GROUP BY Good: SELECT col1, col2, col3, MAX(col4) … GROUP BY col1, col2, col3 Also good: SELECT col1, col2, col3, MAX(col4) … GROUP BY col1, col2, col3, col5, col6 No other columns = no GROUP BY needed SELECT … Read more
What would be useful here would be a LIKE ANY predicate as is available in PostgreSQL SELECT * FROM tbl WHERE my_col LIKE ANY (ARRAY[‘%val1%’, ‘%val2%’, ‘%val3%’, …]) Unfortunately, that syntax is not available in Oracle. You can expand the quantified comparison predicate using OR, however: SELECT * FROM tbl WHERE my_col LIKE ‘%val1%’ OR … Read more
Instead of using count(*) you can SELECT * and you will return all of the details that you want including data_type: SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name=”Address” MSDN Docs on INFORMATION_SCHEMA.COLUMNS
Check out the documentation for the SELECT statement, in particular this section: Logical Processing Order of the SELECT statement The following steps show the logical processing order, or binding order, for a SELECT statement. This order determines when the objects defined in one step are made available to the clauses in subsequent steps. For example, … Read more
For a regular expression, you would use: re.match(r’Run.*\.py$’) A quick explanation: . means match any character. * means match any repetition of the previous character (hence .* means any sequence of chars) \ is an escape to escape the explicit dot $ indicates “end of the string”, so we don’t match “Run_foo.py.txt” However, for this … Read more
The subject of the question mentions pgAdmin 4, so here’s how to do it there. First, add a column to your table, then click the little edit icon: Then go to Constraints and select the Identity type: This generates SQL similar to this: CREATE TABLE public.my_table_name ( id integer NOT NULL GENERATED ALWAYS AS IDENTITY, … Read more
INSERT INTO `table` (`primary_key`) VALUES (NULL);
No because you need to select them. However you can create a stored proc wrapper, which may defeat the point of having a table function.
SQL Server Maximum Columns Limit Bytes per short string column 8,000 Bytes per GROUP BY, ORDER BY 8,060 Bytes per row 8,060 Columns per index key 16 Columns per foreign key 16 Columns per primary key 16 Columns per nonwide table 1,024 Columns per wide table 30,000 Columns per SELECT statement 4,096 Columns per INSERT … Read more
Set the default value when you add the new column: create sequence rid_seq; alter table test add column rid integer default nextval(‘rid_seq’); Altering the default value for existing columns does not change existing data because the database has no way of knowing which values should be changed; there is no “this column has the default … Read more