Merge 15337dfd71 into 6fb3b95ade

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1431 TILs and counting..._
+_1430 TILs and counting..._
 
 ---
 
@@ -734,7 +734,6 @@ _1431 TILs and counting..._
 - [Generate Series Of Numbers](postgres/generate-series-of-numbers.md)
 - [Generating UUIDs With pgcrypto](postgres/generating-uuids-with-pgcrypto.md)
 - [Get A Quick Approximate Count Of A Table](postgres/get-a-quick-approximate-count-of-a-table.md)
-- [Get Row Count For Most Recent Query](postgres/get-row-count-for-most-recent-query.md)
 - [Get The Size On Disk of An Index](postgres/get-the-size-on-disk-of-an-index.md)
 - [Get The Size Of A Database](postgres/get-the-size-of-a-database.md)
 - [Get The Size Of A Table](postgres/get-the-size-of-a-table.md)

postgres/get-row-count-for-most-recent-query.md

@@ -1,65 +0,0 @@
-# Get Row Count For Most Recent Query
-
-Anytime you execute a query in `psql`, there is a _row count_ associated with
-that query. This is most naturally understood with a `select` query where a
-discreet number of rows are returned. We typically see the row count (e.g. `(19
-rows)`) right below the result set.
-
-You can always reference the row count of the most recent query with [the
-`:ROW_COUNT`
-variable](https://www.postgresql.org/docs/current/app-psql.html#APP-PSQL-VARIABLES-ROW-COUNT).
-Here we use `\echo` to print it out.
-
-```sql
-> select generate_series(2,20);
- generate_series
------------------
-               2
-               3
-               4
-               5
-               6
-               7
-               8
-               9
-              10
-              11
-              12
-              13
-              14
-              15
-              16
-              17
-              18
-              19
-              20
-(19 rows)
-
-Time: 12.338 ms
-> \echo :ROW_COUNT
-19
-```
-
-For some queries, like one that induces a pager (e.g. `less`) to be used,
-you'll lose track of the row count once the pager closes. This is where being
-able to reference the row count without rerunning the query is most useful.
-
-```sql
-> select generate_series(2,2000);
-Time: 9.815 ms
-> \echo :ROW_COUNT
-1999
-```
-
-Notice, we can also get a row count from other kinds of queries like this
-`insert` statement.
-
-```sql
-> insert into users (id) values (50001), (50002), (50003);
-INSERT 0 3
-Time: 2.804 ms
-> \echo :ROW_COUNT
-3
-```
-
-[source](https://postgresql.verite.pro/blog/2024/05/13/advanced-psql-coproc.html)