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How do I join two SQLite tables in my Android application?
I have an Android project that has a database with two tables: tbl_question and tbl_alternative .
4 Answers
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How to search a specific value in all tables (PostgreSQL)?
...E OR REPLACE FUNCTION search_whole_db(_like_pattern text)
RETURNS TABLE(_tbl regclass, _ctid tid) AS
$func$
BEGIN
FOR _tbl IN
SELECT c.oid::regclass
FROM pg_class c
JOIN pg_namespace n ON n.oid = relnamespace
WHERE c.relkind = 'r' -- only t...
On Duplicate Key Update same as insert
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If table tbl already has row (1,10) then: INSERT INTO tbl(id, a) VALUES(1,2) ON DUPLICATE KEY UPDATE a=VALUES(a) will set a = 2. While INSERT INTO tbl(id, a) VALUES(1,2) ON DUPLICATE KEY UPDATE a=a will set a = 10
...
MySQL Data - Best way to implement paging?
... rows to return. The offset of the initial row is 0 (not 1):
SELECT * FROM tbl LIMIT 5,10; # Retrieve rows 6-15
To retrieve all rows from a certain offset up to the end of the result set, you can use some large number for the second parameter. This statement retrieves all rows from the 96th row to...
How to drop column with constraint?
...ematic DEFAULT constraint, after that you can drop the column
alter table tbloffers drop constraint [ConstraintName]
go
alter table tbloffers drop column checkin
But the error may appear from other reasons - for example the user defined function or view with SCHEMABINDING option set for them.
U...
SET versus SELECT when assigning variables?
...this difference should be kept in mind :
DECLARE @A INT = 2
SELECT @A = TBL.A
FROM ( SELECT 1 A ) TBL
WHERE 1 = 2
SELECT @A
/* @A is 2*/
---------------------------------------------------------------
DECLARE @A INT = 2
SET @A = (
SELECT TBL.A
FROM ( SELECT ...
PostgreSQL: insert from another table
...
For referential integtity :
insert into main_tbl (col1, ref1, ref2, createdby)
values ('col1_val',
(select ref1 from ref1_tbl where lookup_val = 'lookup1'),
(select ref2 from ref2_tbl where lookup_val = 'lookup2'),
'init-load'
);
...
Which timestamp type should I choose in a PostgreSQL database?
...oing in to the database is stored with an offset of zero:
CREATE TABLE my_tbl (
my_timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
CHECK(EXTRACT(TIMEZONE FROM my_timestamp) = '0')
);
test=> SET timezone = 'America/Los_Angeles';
SET
test=> INSERT INTO my_tbl (my_timestamp) VALUE...
How to dump a table to console?
...
found this:
-- Print contents of `tbl`, with indentation.
-- `indent` sets the initial level of indentation.
function tprint (tbl, indent)
if not indent then indent = 0 end
for k, v in pairs(tbl) do
formatting = string.rep(" ", indent) .. k .. ": "
...
Expansion of variables inside single quotes in a command in Bash
...
Below is what worked for me -
QUOTE="'"
hive -e "alter table TBL_NAME set location $QUOTE$TBL_HDFS_DIR_PATH$QUOTE"
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