$result = mysql_query($sql,$conn) or die(mysql_error()); Because I copied the same users table and rename it to users_group1, users_group2, users_group3 and so on is there anyway you could Insert INTO the other users table I created ? I want the other users table to update wi...
The query joins many tables, and the columns in the ORDER BY are not all from the first nonconstant table that is used to retrieve rows. (This is the first table in the EXPLAIN output that does not have a const join type.) So for my case, given that the two columns I'm ordering...
Query to execute the MySQL statement: UPDATE library l, stu_book s SET l.book_count = l.book_count - 2, s.book_count = s.book_count + 2 WHERE l.id = s.book_id; In the above query, internally, the inner join combines the two tables and operates on the combined table after ...
CREATETABLEtest(idINTNOTNULL,last_nameCHAR(30)NOTNULL,first_nameCHAR(30)NOTNULL,PRIMARYKEY(id),INDEXname(last_name,first_name)); Thenameindex is an index over thelast_nameandfirst_namecolumns. The index can be used for lookups in queries that specify values in a known range for combinatio...
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table flushes are detected and reported as errors. 0) GET_LOCK("lock1","lock2",...) syntax is not supported (but this mostly seems like a syntax sugar). -) RELEASE_LOCK still releases only individual locks. There is no simple way to release all locks in connection. -) There is no...
6 Optimizing a simple query on a large table 2 MySQL slow query 2 Performance of mysql equi-join observed in HDD and SSD 1 Is there anything I can do to optimise this complex query? 2 Conditional aggregate on existing query 1 Poor performance when at least one of the left joins ...
The example shows an inner join using the comma operator, but multiple-table UPDATE statements can use any type of join allowed in SELECT statements, such as LEFT JOIN. --- However, multiple tables update operation seems to behaviour questionably. I just wanna swap the value of name column...
2 transactions in one stored procedure 4 digit number to add to table 8 KB pages to MB or GB 9 digit date number (ex.01.01.2014 => 131989761) A better way to join the same table multiple times? A cursor with the name ' ' already exists. A cursor with the name 'cur1' already ex...
I want to join more than one table using left join. I have a table that stores shop profile where id field is primary key. This id field is foriegn key in orders, products and customers table. Now i want to show a listing in one query. I tried following query, but its giving incor...