大约有 47,000 项符合查询结果(耗时:0.0241秒) [XML]

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postgresql: INSERT INTO … (SELECT * …)

...ostgres CREATE TABLE tblA (id serial, time integer); INSERT INTO tblA SELECT id, time FROM dblink('dbname=dbtest', 'SELECT id, time FROM tblB') AS t(id integer, time integer) WHERE time > 1000; TABLE tblA; id | time ----+------ 1 | 5000 2 | 2000 (2 rows) PostgreSQL has ...
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What is the difference between “INNER JOIN” and “OUTER JOIN”?

...he intersection of the two tables, i.e. the two rows they have in common. select * from a INNER JOIN b on a.a = b.b; select a.*, b.* from a,b where a.a = b.b; a | b --+-- 3 | 3 4 | 4 Left outer join A left outer join will give all rows in A, plus any common rows in B. select * from a LEFT OUT...
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How do I find duplicate values in a table in Oracle?

...then use a HAVING clause to find values that appear greater than one time. SELECT column_name, COUNT(column_name) FROM table_name GROUP BY column_name HAVING COUNT(column_name) > 1; share | impr...
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Why are Where and Select outperforming just Select?

... Select iterates once over the entire set and, for each item, performs a conditional branch (checking for validity) and a + operation. Where+Select creates an iterator that skips invalid elements (doesn't yield them), perform...
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mysql -> insert into tbl (select from another table) and some default values [duplicate]

As the title says, I am trying to insert into one table selecting values from another table and some default values. 5 Ans...
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Fastest check if row exists in PostgreSQL

... Use the EXISTS key word for TRUE / FALSE return: select exists(select 1 from contact where id=12) share | improve this answer | follow ...
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SQL query return data from multiple tables

...rows affected (0.00 sec) Records: 5 Duplicates: 0 Warnings: 0 mysql> select * from colors; +----+-------+----------+ | id | color | paint | +----+-------+----------+ | 1 | Red | Metallic | | 2 | Green | Gloss | | 3 | Blue | Metallic | | 4 | White | Gloss | | 5 | Black | Gloss ...
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How to select option in drop down protractorjs e2e tests

I am trying to select an option from a drop down for the angular e2e tests using protractor. 31 Answers ...
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MySQL Insert Where query

...INSERT INTO Users(weight, desiredWeight) VALUES (160,145) INSERT using a SELECT statement INSERT INTO Users(weight, desiredWeight) SELECT weight, desiredWeight FROM AnotherTable WHERE id = 1 share | ...
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Passing an array to a query using a WHERE clause

...y external input is sanitized. $ids = join("','",$galleries); $sql = "SELECT * FROM galleries WHERE id IN ('$ids')"; share | improve this answer | follow ...