大约有 37,000 项符合查询结果（耗时：0.0223秒） [XML]
Resizing UITableView to fit content
...ve a question in a UILabel and a multiple choice answers displayed in UITableView , each row showing a multiple choice. Questions and answers will vary, so I need this UITableView to be dynamic in height.
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SQLite - How do you join tables from different databases?
...econd SQLite database, but I'm having a hard time figuring out how to join tables from the different databases.
3 Answers
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SQL Call Stored Procedure for each Row without using a cursor
How can one call a stored procedure for each row in a table, where the columns of a row are input parameters to the sp without using a Cursor?
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SQL exclude a column using SELECT * [except columnA] FROM tableA?
We all know that to select all columns from a table, we can use
41 Answers
41
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Does MySQL ignore null values on unique constraints?
... MySQL allows multiple NULLs in a column with a unique constraint.
CREATE TABLE table1 (x INT NULL UNIQUE);
INSERT table1 VALUES (1);
INSERT table1 VALUES (1); -- Duplicate entry '1' for key 'x'
INSERT table1 VALUES (NULL);
INSERT table1 VALUES (NULL);
SELECT * FROM table1;
Result:
x
NULL
NULL...
How do you set a default value for a MySQL Datetime column?
...that with DATETIME...
But you can do it with TIMESTAMP:
mysql> create table test (str varchar(32), ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP);
Query OK, 0 rows affected (0.00 sec)
mysql> desc test;
+-------+-------------+------+-----+-------------------+-------+
| Field | Type | Null | ...
Postgres: INSERT if does not exist already
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There is one caveat/side effect. In a table with sequence column (serial or bigserial), even if no row is inserted the sequence is incremented at every insert attempt.
– Grzegorz Luczywo
Jul 2 '17 at 12:10
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Select Last Row in the Table
I would like to retrieve the last file inserted into my table. I know that the method first() exists and provides you with the first file in the table but I don't know how to get the last insert.
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align right in a table cell with CSS
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It depends. I have a paragraph, which is block, inside a table cell (css display: table-cell), and if I give that paragraph a width of 100% it starts to respect text-align right. I assume defining a width isn't always the best thing.
– Costa
M...
Counting null and non-null values in a single query
I have a table
26 Answers
26
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